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tankabanditka [31]
4 years ago
13

The average noise level in a diner is 30 decibels with a standard deviation of 6 decibels. ninety-nine percent of the time, the

noise level is below what value?
Business
1 answer:
Artemon [7]4 years ago
6 0
<span>Assuming a normal distribution the noise level is below 44dB 90% of the time. Looking up the standard deviation that goes along with .01 on a normal distribution chart, we find that 2.33 standard deviations is the answer. Given the standard deviation of six we turn this in to deviation in decibels from the mean: 6*2.33 = 13.98 Add this to the mean to get 30+13.98=43.98 which we round to 44dB</span>
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