A researcher wishes to estimate the mean number of miles driven by 4-year-old cars. The population standard deviation of miles driven by all chevy owners is 15,500 milesl how man cars must be sampled so that a 92% confidence interval will have a margin of error of 1000 miles?

The sample size must be approximately 1304.      

Step-by-step explanation:

We are given the following in the question:

Population standard deviation = 15,500 miles

We have to construct a 92% confidence interval with margin of error of 1000 miles.

Margin of error =

Putting values, we get,

The sample size must be approximately 1304.

22.83 repeating

step-by-step explanation:

137 ÷ 6 is 22.8333333 therefore we understand that 3 is repeating.

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answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %