Question

4. The amount of electricity bills for all households in a city have a skewed probability distribution with a mean of $145 and a standard deviation of $30. Find the probability that the mean amount of electric bills for a random sample of 71 households selected from the city will be

a. between $131.5 and $136.25.

b. more than population mean by at least $4.5

Answer 1

A) Required probability is 0.0595

B) Required prob is 0.44038

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