Please help with part D, thanks! A trucking company determined that the distance traveled per truck per year is normally​ distributed, with a mean of 30 thousand miles and a standard deviation of 12...


Please help with part D, thanks!



A trucking company determined that the distance traveled per truck per year is normally​ distributed, with a mean of 30 thousand miles and a standard deviation of 12 thousand miles.


a. What proportion of trucks can be expected to travel between 16 and 30 thousand miles in a​ year?

The proportion of trucks that can be expected to travel between 16 and 30
thousand miles in a year is 0.3784


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 than 50 thousand miles in a year is 25.02%

c. How many miles will be traveled by at least 75​% of the​ trucks?

The number of miles that will be traveled by at least 75​% of the trucks is 21,906 miles.


d. What are your answers to parts​ (a) through​ (c) if the standard deviation is 10 thousand​ miles?

If the standard deviation is 10 thousand​ miles, the proportion of trucks that can be expected to travel between 16 and 30 thousand miles in a year is ???




Jun 02, 2022
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