Lightbulbs

The physical plant at the main campus of a large state university recieves daily requests to replace fluorescent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 48 and a standard deviation of 10. Using the empirical rule, what is the approximate percentage of lightbulb replacement requests numbering between 38 and 48?

Correct answer:

p =  34.13 %

Step-by-step explanation:

μ=48 σ=10  p0=N(38<x<48) p0=0.3413  p=100 p0=100 0.3413=34.13%

Use the normal distribution table.



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