According to the U.S. Energy Information Administration, the mean monthly household electric bill in the United States
Question:
According to the U.S. Energy Information Administration, the mean monthly household electric bill in the United States in a recent year was $110.14. Assume the amounts are normally distributed with standard deviation
$20.00.
a. What proportion of bills are greater than $130?
b. What proportion of bills are between $85 and $140?
c. What is the probability that a randomly selected household had a monthly bill less than
$120?
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