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Nuetrik [128]
3 years ago
15

LINKS AND RIDICULOUS ANSWERS WILL BE REPORTED! CORRECT ANSWER WILL BE MARKED BRAINLIEST

Mathematics
1 answer:
asambeis [7]3 years ago
4 0

Answer:

6.7 minutes

Step-by-step explanation:

117 miles per hour

117/60 = 1.95 (this is how fast he travels per minute)

13/1.95 = 6.66666666667 minutes which is

= 6.7 to the nearest tenth.

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How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that
zimovet [89]

Answer:

61 commuters must be randomly selected to estimate the mean driving time of Chicago commuters.                

Step-by-step explanation:

Given : We want 95% confidence that the sample mean is within 3 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

To find : How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?

Solution :

At 95% confidence the z-value is z=1.96

The sample mean is within 3 minutes of the population mean i.e. margin of error is E=3 minutes

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The formula of margin of error is given by,

E=\frac{s\times z}{\sqrt{n}}

Substitute the value in the formula,

3=\frac{12\times 1.96}{\sqrt{n}}

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