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Electric bills: According to a government energy agency, the mean monthly household electricity bill in...

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Electric bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011was $109.99. Assume the amounts are normally distributed with standard deviation $17.00.(a) What proportion of bills are greater than $120?(b) What proportion of bills are between $80 and $135?(c) What is the probability that a randomly selected household had a monthly bill less than $105?Round the answers to at least four decimal places.The proportion of bills that are greater than $120 is

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