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In: Statistics and Probability

According to a government energy agency, the mean monthly household electricity bill in the United States...

According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $108.99 . Assume the amounts are normally distributed with standard deviation $19.00 .

(a) What proportion of bills are greater than $133 ?

(b) What proportion of bills are between $82 and $140 ?

(c) What is the probability that a randomly selected household had a monthly bill less than $119 ? Round the answers to at least four decimal places.

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orchestra answered 1 year ago
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