Mathematics, 30.11.2021 04:40, tot92

The average electric bill in a residential area is $72 for the month of April. The standard deviation is $6. If the amounts of the electric bills are normally distributed, find the probability that the mean of the bill for 15 residents will be less than $75. Round your answer to the nearest ten thousandth.

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The average electric bill in a residential area is $72 for the month of April. The standard deviatio...