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Question 4 of 7 (1 point) Altempt 1 of Unlimited View.guestion in a non 72 Section Eartable Electric bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.72. Assume the amounts are normally distributed with standard deviation $24.00. (a) What proportion of bills are greater than $1317 (b) What proportion of bills are between $87 and $1407 (c) What is the probability that a randomly selected household had a monthly bill less than $1257 Round the answers to at least four decimal places. Part: 0/3 Part 1 of 3 The proportion of bills that are greater than $131 is