Question

Suppose that taxis in New York are driven an average of 60,000 miles per year with a standard deviation of 11,000 miles. Assume that the mileage driven for a year is normally distributed.

How many miles will the middle 95% of taxis have driven in one year?

Answer 1

Middle 95% is between average-2*stddev and average+2*stddev.
This is not so relevant, only the fact that the normal ditribution is symmetric:

Some taxis wil have a lower than 60000 mileage, some a higher.
In general, the middle 95% will have a mileage of .... 60000.

Answer 2

thanks

Answer 3

YW!