A trucking company determined mat the distance traveled per truck per year is no

Question

A trucking company determined mat the distance traveled per truck per year is normally distributed with a mean of 30 thousand miles and a standard deviation of 10 thousand miles Complete parts (a) through (c) below. a. What proportion of trucks can be expected to travel between 19 and 30 thousand miles in a year? The proportion of trucks that can be expected to travel between 19 and 30 thousand miles in a year is (Round to four decimal places as needed.) b. What percentage of trucks can be expected to travel either less than 20 or more than 50 thousand miles in a year? The percentage of trucks that can be expected to travel either less than 20 or more man 50 thousand miles in a year is %. (Round to two decimal places as needed) c. How many miles will be traveled by at least 80% of the trucks? The amount of miles that will be traveled by at least 80% of the trucks is miles. (Round to me nearest mile as needed.)

Explanation / Answer

From statistical software output, the required probabilities are:

a) 0.3643

b) 0.1814

c) 22

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