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jeyben [28]
2 years ago
14

5

Mathematics
1 answer:
valina [46]2 years ago
6 0
I think 28fa haha s an
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Provide an appropriate response. In order to efficiently bid on a contract, a contractor wants to be 95% confident that his erro
lidiya [134]

Answer:

d. 20

Step-by-step explanation:

Standard deviation is 4.5

Margin error for the problem is 2 hours

Probability 95%, that means that the siginficance level α is 1 – p

α = 1 – 0.95 = 0.05

margin of error (ME) can be defined as follows

ME = Z(α/2) * standard deviation/ √n

Where n is the sample size

Z(0.05/2) = Z(0.025)

Using a z table Z = 1.96

Now, replacing in the equation and find n

2 = 1.96 * 4.5/ √n

2 = 8.82/√n

√n = 8.82/2

√n = 4.41

n = 4.41^2

n = 19.44 ≈ 20

5 0
3 years ago
Find the difference between 430 and 144
nata0808 [166]
286. you just subtract the two numbers 
5 0
2 years ago
Read 2 more answers
How do i round 4,398,202 to the nearest 100
Vikentia [17]
When you round 4, 398, 202 to the nearest 100 it means to ignore the 4,398 and just look at 202. You could either round to 200 or 300 since you want to round to the nearest 100. Since the ones place is 2, you round the number to 200.

Answer: 4,398,200
8 0
3 years ago
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Nine times a number decreased by four is at least twenty three
Andru [333]
The answer is any whole number larger than 3
6 0
3 years ago
Rugs sell for 8$ per square foot. Beth bought a 9-foot-long rectangular rug for $432. How wide was the rug?
lawyer [7]
If you know the rugs sell for 8$ per square foot and the total spend was $432. You divide 432 by 8 to find the total number of square foot of the rug. Which is 54. To find total square foot you find the area. So the area of a rectangle is L*W. So 54 = 9*width. So just divide 54 by 9 and you get the width of the rug. The width is 6 foot. Now you check. A nine by 6 rugs square foot is 54. and then times by 8 and you get 432 total. So you know the rug is 6 foot wide. :)
5 0
3 years ago
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