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A trucking company determined that the distance traveled per truck per year is normally distributed with a mean of 80,000 miles and a standard deviation of 12,000 miles.

a. What proportion of trucks can be expected to travel btwn 65 & 80 thousand miles per year?

b. What % of trucks can be expected to travel either below 70 or above 97 thousand miles in a year?

c. What is the longest distance that is traveled by at least 65% of the trucks is _______ miles?

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Statistics and Probability, Statistics

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