Business, 03.08.2021 22:50, Homepage10

According to the U. S. Energy Information Administration, the mean monthly household electric bills in the United States in 2007 was $99.70. Assume the amounts are normally distributed with a standard deviation of $20. Answer the following questions. (Use the z table, keep four decimal places for proportions, and keep two decimal places for bill amounts.) 1) What proportion of household electric bills are over $131.50?
2) What proportion of household electric bills are less than $80?
3) What is the probability that a randomly chosen household electric bill is between $85.50 and $111.50
4) What is the probability that a randomly chosen household electric bill is either higher than $105 or less than $90?
5) What household electric bill amount represents the most expensive 30% of household electric bills?

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According to the U. S. Energy Information Administration, the mean monthly household electric bills...