The physical plant at the main campus of a large state university receives daily

Question

The physical plant at the main campus of a large state university receives daily request to replace fluorescent lightbulbs. The distribution of the number of daily request is bell shaped and has a mean of 64 and a standard deviation of nine. Using the empirical rule, what is the percentage of lightbulb replacement request numbering between 64 and 91? Round to 2 decimal places. The physical plant at the main campus of a large state university receives daily request to replace fluorescent lightbulbs. The distribution of the number of daily request is bell shaped and has a mean of 64 and a standard deviation of nine. Using the empirical rule, what is the percentage of lightbulb replacement request numbering between 64 and 91? Round to 2 decimal places.

Explanation / Answer

Mean is 64 and standard deviation is 9

Z for upper value is (91-64)/9= 27/9=3, thus it is 99%

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