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 1196719: 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 54 and a standard deviation of 8. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 54 and 78?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi

μ = 54     σ = 8 
 78 = μ + 3σ    (54 + 24  = 78)
Using the 68-95-99.7 rule
P( 54 ≤ x ≤ 78) = 99.7%/2 = 49.85%

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