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In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual ground...

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Basic Math

In a recent year, about two-thirds of U.S. households purchasedground coffee. Consider the annual ground coffee expenditures forhouseholds purchasing ground coffee, assuming that theseexpenditures are approximately distributed as a normal randomvariable with a mean of $75 and a standard deviation of $10.

a. Find the probability that a household spent less than$65.00.

b. Find the probability that a household spent more than$80.00.

c. What proportion of the households spent between $65.00 and$80.00?

d. 99% of the households spent less than what amount?

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Answer & Explanation Solved by verified expert
4.4 Ratings (536 Votes)
Mean 75Standard deviation 10aWe have to the probability that a household spent less than6500That is we have to find PX 65For finding this probability we    See Answer
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