Monthly Electric Bills In A Large City Are Normally

Monthly electric bills in a large city are normally distributed with a mean of $240 and a standard deviation of $45. What is the probability that a randomly selected electric bill has a value between $280 and $320?show formula please

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Monthly electric bills in a large city are normally

Question
Monthly electric bills in a large city are normally distributed with a mean of $240 and a standard deviation of $45. What is the probability that a randomly selected electric bill has a value between $280 and $320?

show formula please

find the cost of your paper