Electricity bills:According to a government energy agency, the mean monthly household electricity bill in the United States in 2011

was $109.54. Assume the amounts are normally distributed with standard deviation $25.00

. Use the TI-84 Plus calculator to answer the following.

(a) What proportion of bills are greater than $132 ?

(b) What proportion of bills are between $90 and $145 ?

(c) What is the probability that a randomly selected household had a monthly bill less than $129 ?

Round the answers to at least four decimal places.

Part 1 of 3

The proportion of bills that are greater than $132 is ?

Part 2 of 3

The proportion of bills that are between $90 and $145 is ?

Part 3 of 3

The probability that a randomly selected household had a monthly bill less than $129 is ? .