Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in  2011  was  $108.87 . Assume the amounts are normally distributed with standard deviation  $18.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete   Part 1 of 3     (a) What proportion of bills are greater than  $134 ? The proportion of bills that are greater than  $134  is    .       Part: 1 / 3 1 of 3 Parts Complete   Part 2 of 3     (b) What proportion of bills are between  $83  and  $145 ? The proportion of bills that are between  $83  and  $145  is    .       Part: 2 / 3 2 of 3 Parts Complete   Part 3 of 3     (c) What is the probability that a randomly selected household had a monthly bill less than  $118 ? The probability that a randomly selected household had a monthly bill less than  $118  is

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