Question

Refer to Exercise 3.115. Suppose the times taken to learn the basics of this software program by all students have a bell-shaped distribution with a mean of 200 minutes and a standard deviation of 20 minutes.
a. Using the empirical rule, find the percentage of students who will learn the basics of this software program in
i. 180 to 220 minutes
ii. 160 to 240 minutes
b. Using the empirical rule, find the interval that contains the times taken by 99.7% of all students to learn this software program.


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  • CreatedAugust 25, 2015
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