Asked by helppp
The average electric bill in a residential area is $72 for the month of April. The standard deviation is $5. If the amounts of the electric bills are normally distributed, find the probability that the mean of the bill is less than $78.
Answers
Answered by
oobleck
You can play around with Z table stuff at
davidmlane.com/hyperstat/z_table.html
davidmlane.com/hyperstat/z_table.html
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