Question

A trucking company determined that the distance traveled per truck per year is normally​ distributed, with a mean of 70 thousand miles and a standard deviation of 12 thousand miles. Complete parts​ (a) through​ (c) below.

a. What proportion of trucks can be expected to travel between 54 and 70 thousand miles in a​ year? The proportion of trucks that can be expected to travel between 54 and 70 thousand miles in a year is 0.4082. ​(Round to four decimal places as​ needed.)

b.What percentage of trucks can be expected to travel either less than 45 or more than 80 thousand miles in a​ year?

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

The amount of miles that will be traveled by at least 70% of the trucks is nothing miles (Round to the nearest mile as​ needed.)

Answer 1