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.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.