the amount of electric bills for a household in a city have a skewed probablility distribution with a mean of $65 and a standard deviation of $25.

the amount of electric bills for a household in a city have a skewed probablility distribution with a mean of $65 and a standard deviation of $25. find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be: between $58 and $63