SOLUTION: 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

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Question 1160488: 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 57 and a standard deviation of 3. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 51 and 57?
Answer by Boreal(15235) About Me  (Show Source):
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Between 51 and 57 is between -2 sd and 0 sd
95% of the data are between -2 and +2 sd
This is half of that, so approximately 47.5% are between those two points.