a) The average life of the lot is 1078.33 hrs, b) the total life is 107833.33 hours, c) a proportion of 1/2 bulbs have a life exceeding 1000 hrs while d) an estimation of 50 bulbs have a life exceeding 1000 hours.
It is given that the number of bulbs in a given lot is 100.
The number of bulbs in the sample selected is 6
The life of the sample bulbs was
no. life (hours)
1 950
2 1210
3 1070
4 840
5 1420
6 980
a)
The average life of the bulbs can be calculated by
the sum of the lives of the sample/ no. of samples
= (950 + 1210 + 1070 + 840 + 1420 + 980) / 6
= 1078.3333 hrs
b) The total lives of the bulbs in the lot will be
average life X no. of bulbs
= 1078.3333 X 100
= 107833.33 hrs
c)
We can gain the proportion of the bulbs that have a life exceeding 1000 hrs by the given sample
The bulbs
2, 3, and 5 have lives exceeding 1000 hrs.
Hence, out of 6 bulbs, 3 have lives exceeding 1000 hrs.
Therefore the proportion
= 3/6
= 1/2
d)
The number of bulbs in the lot with a life exceeding 1000 will be
proportion X no. of bulbs
= 1/2 X 100
= 50 bulbs
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A bag contains 150 marbles. Some are blue the rest is white. There are 21 blue marvles for every 4 white marbles. How many blue marbles are there.
There are 126 blue marbles.
Total marbles in the bag=150
There are 21 blue marbles for every 4 white marbles then the sequence will be⇒ 4+21+4+21+4+21+4+21+4+21+4+21=150
21 blue marbles appear 6 times for every 4 blue marbles
So 21×6=126 blue marbles and 4×6=24, then 126+24=150 total marbles
∴There will be a total of 126 blue marbles along with 24 white marbles among the 150 marbles.
At the bakery, they have 4 and a 1/8 pies for sale. They sell 1⁄4 of a pie for$5. How many pieces do they have to sell, and how much money will they make?
The number of pieces the bakery will sell is 16 and a half. The total amount of money they will make is $82.5.
What is the number of pieces of pies to be sold?To get the number of pieces of pies that they have to sell, we need to first determine how many 1/4 pies are in 4 and 8 pieces of bread. Going by that, we can see that:
1/4x of 4 = 16.
Also, 1/4x of 1/8 = 1/2.
So, the total number of pies that they have to sell is 16 and a half.
Now if 1/4 of a pie costs $5, then 4 1/8 will be equal to 33/8 × 5 ÷ 1/4.
This is equal to 165/8 × 4 = $82.5
So, the total amount of money that the bakery will make will be $82.5.
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a student in public administration wants to estimate the mean monthly earnings of city council members in large cities. she can tolerate a margin of error of $100 in estimating the mean. she would also prefer to report the interval estimate with a 95% level of confidence. the student found a report by the department of labor that reported a standard deviation of $1,000. what is the required sample size? (hint: round your answer up to the nearest whole number)
the required sample size for the interval estimate with a 95% level of confidence is 385
since we are given the margin of error which is f $10 and a standard deviation which is $1,000, and we are also given the level of confidence which is 95%
so the formula we are referring to calculate the sample size is :
n=z(0..95)*s²/ E
here, E is the margin of error, S is the standard deviation
so z score of 0.95 is 1.96
so n = 1.96*1000^2/100
= 384.16 ,which is almost 385
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find the surface area of a rectangle prism that has the following deminsions.
length : 2ft
width : 14in
height : 11in
surface area : in 2
Answer:
SA(surface area) of the rectangular prism is 1,510 in inches
Step-by-step explanation:
SA=2(lh+lw+hw)
2inch=24ft
lh=264
lw=336
wh=154
755*2=1,510
The ___ of a hyperbola is one of two points such that the difference of the distances from any point on the hyperbola to the foci is a constant.
The POINT of a hyperbola is one of two points such that the difference of the distances from any point on the hyperbola to the foci is a constant.
What is hyperbola?A hyperbola is a significant conic section in mathematics that is created by the intersection of a double cone with a plane surface, though not always at the center. A hyperbola is symmetric along its conjugate axis and resembles the ellipse in many ways. A hyperbola is subject to concepts like foci, directrix, latus rectus, and eccentricity. Examples of hyperbola that are frequently seen include the path taken by the tip of a sundial's shadow, the scattering trajectory of subatomic particles, etc.Here, we'll use instances that have been solved to better grasp the definition, formula, derivation, and standard forms of hyperbolas.Hence, The POINT of a hyperbola is one of two points such that the difference of the distances from any point on the hyperbola to the foci is a constant.
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Helppppp super confused !
The expression that is equivalent is 6(y + 1) and 6y + 6.
The expression that are not equivalent are 3(x + 3) and 3x + 6 and x(x + 4) and x² + 4.
How to find equivalent expression?Two expressions are said to be equivalent if they have the same value irrespective of the value of the variable(s) in them.
Equivalent algebraic expressions are those expressions which on simplification give the same resulting expression.
Now, let's check if the expression are equivalent by simplifying it.
3(x + 3) and 3x + 6
3x + 9 and 3x + 6
Therefore, the expressions are not equivalent.
6(y + 1) and 6y + 6
6y + 6 and 6y + 6
They are equivalent expression.
x(x + 4) and x² + 4
x² + 4x and x² + 4
They are not equivalent expression.
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an instructor gives a course grade of b to students who have total score on exams and homeworks between 800 and 900, where the maximum possible is 1000. if the total scores have approximately a normal distribution with mean 830 and standard deviation 50, about what proportion of the students receive a b?
Let x denote the score. Assuming x follows normal distribution with
mean m = 70 and SD = 5 ,
we first calculate P( x < or = 80)
The SNV is z = (x — m) /SD
When x = 80, Z = ( 80 — 70)/5 = 2
So, P( x < or= 80)
= P( z < or= 2)= Area under the standard normal curve on LHS of z = 2=0.5000 + 0.4772=0. 9772, which is the relative frequency of x < or = 80Given that total number of students is
N = 1000. Let f be the number of students who have scored < or equal to 80,Then f/N = relative frequency = 0.9772Hence f = 0.9772 X N = 0.9772 X 1000 = 977learn more about binomial distrubution click here:
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A bowling ball is pushed with a force of 22. 0 N and accelerates at 5. 5 m/s2. What is the mass of the bowling ball?
When a bowling ball is propelled with a force of 22. 0 N and accelerates at a rate of 5. 5 [tex]ms^{-2}[/tex], its mass is 4. 0 kg.
Newton's Second Law of Motion states that force is the result of mass times acceleration.
[tex]F=m*a[/tex]
[tex]m = F / a[/tex]
A force of 22.0 Newtons ( [tex]kgms^{-2}[/tex] ) and an acceleration of 5.5 meters per second squared were used to drive the bowling ball.
F = 22.0 [tex]kgms^{-2}[/tex] and
a = 5.5 [tex]ms^{-2}[/tex]
Put the values in the formula as replacements.
M = 22 [tex]kgms^{-2}[/tex]/ 5.5 [tex]ms^{-2}[/tex]
Meters per second squared (m/s2) units cancel each other out.
M = 22 kg / 5.5
= 4 kg
The bowling ball weighs 4 kilogram.
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the degree of f(x) is ?
the end behavior is the left side is ?
and the right side is ?
The degree of the polynomial is 5, and the end behavior is:
as x → ∞, f(x) → -∞
as x → -∞, f(x) → ∞
How to get the degree of a polynomial?
For any given polynomial, we define the degree as the largest exponent on the polynomial.
On this case we have:
f(x) = 2x^3 - 3x^5 - x^2 + 1
We can see that the largest exponent is 5, so the degree is 5.
Now, for the ending behavior.
If we have an odd degree (like in this case) we will have opposite ending behaviors in both ends of the domain.
If the leading coefficient is negative (like in this case, it is -3) then the end behavior will be:
as x → ∞, f(x) → -∞
as x → -∞, f(x) → ∞
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Examine the equation below used for determining the balance on a bank account. Look through this chapter and your notes to help you write a problem that could be modeled by the equation.
The balance on the bank account at the end of the third quarter of the year is 2,630.80
How to find the compound interest?
Compound interest is defined as the interest calculated on the principal and the interest accumulated over the previous period.
Compound interest is found using the formula
A=P(1+r/n)ⁿˣ where:
A= Amountr= interest raten= number of interest applied per period and x= number of time periodTherefore, the amount (A)=2630.80
The P=2500
interest rate is 0.17%
Number of interest applied per period is 365 periods and
number of time period is 3.
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If 4x+5y=−5 is a true equation, what would be the value of 8+4x+5y?
Answer:
3
Step-by-step explanation:
[tex]4x + 5y = - 5 \\ 8 + 4x + 5y = {?} \\ 8 + - 5 \\ = 3 \\ 8 + 4x + 5y = 3[/tex]
in case study 19.1, we learned that about 56% of american adults actually voted in the presidential election of 1992, whereas about 61% of a random sample claimed that they had voted. the size of the sample was not specified, but suppose it were based on 1600 american adults, a common size for such studies. (a) into what interval of values should the sample proportion fall 68%, 95%, and almost all of the time? (round your answers to three
Confidence interval for 68% confidence level = (0.548, 0.572)
Confidence interval for 95% confidence level = (0.536, 0.584)
Confidence interval for 99.99% confidence level = (0.523, 0.598)
The mean of this sample distribution is
Mean = μₓ = np = 0.61 × 1600 = 976
But the sample mean according to the population mean should have been
Sample mean = population mean = nP
= 0.56 × 1600 = 896.
To find the interval of values where the sample proportion should fall 68%, 95%, and almost all of the time, we obtain confidence intervals for those confidence levels. Because, that's basically what the definition of the confidence interval is; an interval where the true value can be obtained to a certain level. of confidence.
We will be doing the calculations in sample proportions,
We will find the confidence interval for the confidence levels of 68%, 95% and almost all of the time (99.7%).
Basically the empirical rule of 68-95-99.7 for standard deviations 1, 2, and 3 from the mean.
Confidence interval = (Sample mean) ± (Margin of error)
Sample Mean = population mean = 0.56
The margin of Error = (critical value) × (standard deviation of the distribution of sample means)
Standard deviation of the distribution of sample means = [tex]\sqrt{[p(1-p)/n]}[/tex] =
[tex]\sqrt{[(0.56\times0.44)/1600]}[/tex] = 0.0124
The critical value for 68% confidence interval = 0.999 (from the z-tables)
The critical value for 95% confidence interval = 1.960 (also from the z-tables)
Critical values for the 99.7% confidence interval = 3.000 (also from the z-tables)
Confidence interval for 68% confidence level
= 0.56 ± (0.999 × 0.0124)
= 0.56 ± 0.0124
= (0.5476, 0.5724)
Confidence interval for 95% confidence level
= 0.56 ± (1.960 × 0.0124)
= 0.56 ± 0.0243
= (0.5357, 0.5843)
Confidence interval for 99.7% confidence level
= 0.56 ± (3.000 × 0.0124)
= 0.56 ± 0.0372
= (0.5228, 0.5972)
Therefore,
Confidence interval for 68% confidence level = (0.548, 0.572)
Confidence interval for 95% confidence level = (0.536, 0.584)
Confidence interval for 99.99% confidence level = (0.523, 0.598)
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Answer it now bois now
Answer:
Answer is [tex](\frac{4}{-1})[/tex] option D is correct
pls help!!!
Consider the calculation 2/3 × 5/8 .
Without calculating the product, explain how you know that 3/4 is not the answer.
(p.s. they are fractions)
3.472 divided by ____=0.112 free 25 points!!
When the divisor is missing, you divide the dividend (3.472) by the quotient (0.112)
So, we will do 3.472 divided by 0.112
3.472/0.112 = 31
Another method is multiplication. Multiplication is the opposite of division. We'd multiply 0.112 by 31.
0.112 x 31 = 3.472
In conclusion,
3.472/31 = 0.122
If you need extra help, use this video as a reference
https://youtu.be/9ui8Yh0bwCI?t=83
Answer: 3.472/31 = 0.122
Step-by-step explanation: I hope this helps:)
A rectangular athletic field has an area of 40x² + 190x-50. The width of the athletic field is 8x - 2. What is the length of the athletic field?
Answer:
The length = 5x + 25
Step-by-step explanation:
A = l x w
7. Hannah invests £750 and after 4 years has £844.13. Find the compound interest rate.
If the amount after 4 years is 844.13. Then the rate of the compound interest will be 3%.
What is compound interest?A loan or deposit's interest is computed using the starting principle and the interest payments from the ago decade as compound interest.
We know that the compound interest is given as
A = P(1 + r)ⁿ
Where A is the amount, P is the initial amount, r is the rate of interest, and n is the number of years.
Hannah contributes £750 and following 4 years has £844.13. Then the compound interest rate is given as,
844.13 = 750 (1 + r)⁴
(1 + r)⁴ = 1.1255
1 + r = 1.02999
r = 0.0299
r = 2.99%
r ≈ 3%
If the amount after 4 years is 844.13. Then the rate of the compound interest will be 3%.
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the initial number of views for a reader board was 25. the number of views is growing exponentially at a rate of 18% per week. what is the number of views expected to be four weeks from now? round to the nearest whole number.
The number of views in the four weeks round to the whole number is 48.
Here it is given that the initial number of views for a reader board was 25 and it gets increased at the rate of 18% per week.
We have to find the number of views in the fourth week.
On the first week the increase = 25 + 25× 18%
= 25 + 25 × 18/100
= 25 + 4.5
= 29.5
The second week increase = 29.5 + 29.5 × 18%
= 29.5 + 5.31
= 34.81
The third week increase = 34.81 + 34.81 × 18%
= 34.81 + 6.2658
= 41.0758
The fourth week increase = 41.0758 + 41.0758 × 18%
= 41.0758 + 7.393644
= 48.469444
Therefore the number of views in the four weeks is 48.
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Please help with algebra. Find the formula for an exponential equation that passes through the points, (0,2) and (1,6). The exponential equation should be of the form y=abx.
The exponential function has an equation of f(x) = 2(3)^x
How to determine the equation of the exponential function?From the question, we have the following points that can be used in our computation:
(0, 2) and (1,6)
Also, we understand that
Function type = Exponential function
An exponential function is represented as
f(x) = ab^x
At point (0, 2), we have
2 = ab^0
Evaluate
a = 2
Substitute a = 2 in f(x) = ab^x
f(x) = 2b^x
At point (1, 6), we have
6 = 2b^1
This gives
2b = 6
Divide
b = 3
So, we have
f(x) = 2(3)^x
Hence, the equation of the exponential function is f(x) = 2(3)^x
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Bill wants to save for his son’s college expenses. He knows what tuition will cost in 18 years and knows the interest rate on the bank account. What he doesn’t know is how much to deposit each month to save enough for his son’s college expenses. Which Excel formula would you use?
The Excel formula that Bill would use is PMT.
How to illustrate the information?From Bill's situation, he has the following information:
time = NPER = number of periods = 18 years
RATE of the bank
FV = future value = cost of tuition
PMT, is a financial function, computes the loan payment based on constant payments and a constant interest rate. The Excel PMT function is a financial function that computes loan payments based on a fixed interest rate, the number of periods, and the loan amount. The function's name is derived from the acronym "PMT," which stands for "payment."
In conclusion, the correct option is PMT.
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Complete question
Bill wants to save for his son’s college expenses. He knows what tuition will cost in 18 years and knows the interest rate on the bank account. What he doesn’t know is how much to deposit each month to save enough for his son’s college expenses. Which Excel formula would you use? Choose from FV, PV, PMT, NPER, or RATE.
15 ten büyük 25 den küçük tek sayılar
Answer:
Step-by-step explanation:
15 ile 25 arasında toplam 10 tam sayı var,
buna 25-15=10 şeklinde ulaşabiliriz. Ardından tek sayılar sorulduğu için ve bu 10 tam sayı içerisinde hem tek hemde çift olduğu için sayıyı ikiye böleriz
10/2=5 ve ardından en sonda bulunan 25 sayısını çıkarırız yani, 5-1=4
cevaplar: 17, 19,21,23
a tire manufacturer wishes to investigate the tread life of its tires. a sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inches of tread remaining with a sample standard deviation of 0.09 inches. construct a 95% confidence interval for the population mean.
The confidence interval for the population mean is 0.2896 , 0.3505)
The sample mean is x = 0.32
The sample standard deviation is s = 0.09
The sample size is n = 10
The population standard deviation is unknown and sample size is atleast 10.
Thus use the t distribution.
Replacing the values in the following formula, determine the 95% confidence interval.
95% C.I = x ± t₀.₉₅,ₙ₋₁ . Sm
= x ± t₀.₀₅/₂,₁₀₋₁ . s/√n
= 0.32 ± 2.03 . 0.09/√10
= (0.2896 , 0.3505)
Hence the confidence interval for the population mean is 0.2896 , 0.3505)
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is the number 1.41421356 rational
The number 1.41421356 is not a rational number.
What is a rational number?
A number that can be expressed as a ratio is called a rational number. This indicates that it may be expressed as a fraction, where the numerator (the number on top) and denominator (the number on the bottom) are both whole numbers.
The given number is 1.41421356
The square root of 2 has the approximate value of 1.41421356
The number is non-terminating and non-repeating decimals.
That's why the given number is not a rational number.
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Part A
The graph shows the distance in miles, , a car travels in hours.
Explain why the graph does or does not represent a proportional relationship between the variables and .
Enter your explanation in the box provided.
Part B
Two cars leave from the same city at the same time and drive in the same direction. The table shows the distances traveled by each car.
• Determine whether the relationship between the number of hours traveled and the number of miles traveled is proportional for each car.
• Use the table to explain how you determined your answers.
• Describe how the graph of the distance traveled by each car would support your answers.
Enter your answers and your explanations in the box provided.
fi r e re r er e r er e re r e r er e re
Can someone please help me
What is the equation of the line that passes through the points (-2, -6) and (1, 2)?
The equation of the line that passes through the points (-2,-6) and (1,2) is y = 8x/3-2/3.
According to the question,
We have the following information:
Points through which line is passing = (-2,-6) and (1,2)
Now, we have the following values:
x1 = -2, y1 = -6
x2 = 1 and y2 = 2
We know that the following formula is used to find the slope of the line:
m = (y2-y1)/(x2-x1)
m = (2+6)/(1+2)
m = 8/3
Now, the following formula is used to find the equation of the line:
y-y1 = m(x-x1)
y+6 = 8/3(x+2)
y+6 = 8x/3+16/3
Subtracting 6 from both sides:
y = 8x/3+16/3-6
y = 8x/3-2/3
Hence, the equation of the line that passes through the points (-2,-6) and (1,2) is y = 8x/3-2/3.
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Choose the linear equation that is parallel to the following line y =−1/4 x − 1
Answer:
Any equation that has the same slope as this line will be parallel to it. The slope is -1/4, so whichever equation has -1/4 x in it will be parallel to the line.
A soft drink manufacturer has a daily production cost of C = 70,000 - 120x + 0.055x ^ 2 , where C is the total cost (in dollars) and x is the number of units produced. How many units should they produce each day to yield a minimum cost?
Show all work please.
The minimum cost will be 1091 units.
Define Vertex Formula.
When the graph crosses its symmetry axes, the vertex formula aids in determining the vertex coordinate of a parabola. The vertex point is often represented by (h, k).
We are aware that a parabola's conventional equation is y=ax²+bx+c. The vertex in this case should be near the base of the U-shaped curve if the coefficient of x² is positive. The vertex should be at the peak of the U-shaped curve if the coefficient of x² is negative.
Given expression is,
C = 70,000 - 120x + 0.055x²
For this equation, the graph will be parabola opening upward.
For that, the vertex will be the minimum cost
x = (-b) / 2a
Here, a = 0.055 , b = -120
Now, plug in the values and find 'x'
minimum cost (x) = ( -(-120) ) / ( 2 * 0.055 )
= 120 / 0.11
= 120 / 0.11
= 1090.90 or 1091 units
Therefore, the minimum cost will be 1091 units.
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simply the following ratio:-
2/3:1/6:5/2
Step-by-step explanation:
ratios are special fractions and follow therefore all the fraction rules.
e.g. they follow the rule that for transformations the same multiplications or divisions have to happen for the denominator and the numerator when bringing them to the same denominator.
and they follow the same division and multiplication rules.
2/3 : 1/6 : 5/2 = (2/3)×(2/2) : 1/6 : (5/2)×(3/3) =
4/6 : 1/6 : 15/6 = 4 : 1 : 15
Evaluate the expression.
Do not round your answer.
1/5(3+2+ 5)² =
Answer:
20
Step-by-step explanation:
do parenthesis first
1/5(3+2+ 5)² =
1/5(10)² =
then exponent
1/5(10)² =
1/5(100) =
20