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4. The amount of electricity bills for all households in a city have a skewed probability...

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

Math   Statistics-And-Probability   
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Solution file is attached go through it

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