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27 December, 00:59

The distribution of the number of daily requests is bell-shaped and has a mean of 46 and a standard deviation of 5. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 36 and 46?

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  1. 27 December, 04:08
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    If the mean = 54, 1 standard deviation (+1σ) above the mean = 54+6 = 60

    1 standard deviation (-1σ) below the mean = 54 - 6 = 48

    68% of the data of a normal distribution lies between - 1σ and + 1σ: between 48 - 60 requests

    between 54 - 60 requests (between the mean and + 1σ) is half of this percentage: 68/2 = 34%

    Answer: 34%
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