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 the TI-84 Plus calculator to answer the following. (a) What proportion of bills are greater than  $134 ? (b) What proportion of bills are between  $83  and  $145 ? (c) What is the probability that a randomly selected household had a monthly bill less than  $118 ? Round the answers to at least four decimal places.   Part 1 of 3       The proportion of bills that are greater than  $134  is    .         Part 2 of 3       The proportion of bills that are between  $83  and  $145  is   .         Part 3 of 3       The probability that a randomly selected household had a monthly bill less than  $118  is    .

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