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Question

The maintenance department at the main campus of a large state university receives daily requests to replace fluorecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 50 and a standard deviation of 10. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 50 and 70?

Answer 1

95/2 = 47.5% lie between the mean and 2 sd's above the mean

between 50 and 70

by the empirical rule

if you want a closer approximation

use z tables or a z calculator