Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $110.56. Assume the amounts are normally distributed with standard deviation $25.00. Use Excel to answer the following. Round the answer to four decimal places. Part: 0/3 Part 1 of 3 (a) What proportion of bills are greater than $1257 The proportion of bills that are greater than $125 Is Part: 1/3 Part 2 of 3 (b) What proportion of bills are between $83 and $1437 The proportion of bills that are between $83 and $143 is Rart: 2/3 Part 3 of 3 (c) What is the probability that a randomly selected household had a monthly bill less than $1137 The probability that a randomly selected household had a monthly bill less than $113 is

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