Question

A trucking company determined that the distance traveled per truck per year is normally​ distributed, with a mean of 80

thousand miles and a standard deviation of 10 thousand miles.

How many miles will be traveled by at least 70​% of the​ trucks?

The number of miles that will be traveled by at least 70​% of the trucks is ___miles.

​(Round to the nearest mile as​ needed.)

d. What are your answers to parts​ (a) through​ (c) if the standard deviation is

6thousand​ miles?

If the standard deviation is 6thousand​ miles,the proportion of trucks that can be expected to travel between68and80 thousand miles in a year is nothing.

​(Round to four decimal places as​ needed.)

If the standard deviation is

6thousand​ miles,thepercentage of trucks that can be expected to travel either less than 70or more than 95 thousand miles in a year is  ___%.

​(Round to two decimal places as​ needed.)

If the standard deviation is

6 thousand​ miles, the number of miles that will be traveled by at least 70​% of the trucks is___

miles.

​(Round to the nearest mile as​ needed.)

Answer 1