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2 years ago

5

A man drove 210 miles in 3.5 hours. If the posted speed limit was 55 mph (miles per hour) the entire way, approximately how many

miles per hour over the speed limit was he going?

1 answer:

Alona [7]2 years ago

5 0

Answer:

5mph over the speed limit

Step-by-step explanation:

In 1 hour the man drove 210/3.5=60 miles. 60mph is over the speed limit (55) by 5 mph.

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Tanya [424]

Answer:

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b) sample size ≥ 62

Step-by-step explanation:

Given:

Average cost = $1599

Sample size = 50 persons

Standard deviation = $600

Confidence level is 95%

a) Margin of error = $z\frac{\sigma}{\sqrt{n}}$

Now for confidence level of 95% z-value = 1.96

Thus,

Margin of error = $1.96\frac{600}{\sqrt{50}}$

or

Margin of error = 166.311

b) For Margin of error ≤ 150

$z\frac{\sigma}{\sqrt{n}}$ ≤ 150

or

$1.96\frac{600}{\sqrt{n}}$ ≤ 150

or

$1.96\frac{600}{150}$ ≤ √n

or

√n ≥ 7.84

or

n ≥ 61.4656

Therefore,

sample size ≥ 62

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3 years ago

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Vaselesa [24]

Answer:

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Step-by-step explanation:

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Answer:

Step-by-step explanation:

A.

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B.

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C.

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2 years ago

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