During the past six months, 73.2% of US households purchased sugar. Assume that these...

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During the past six months, 73.2% of US households purchased sugar. Assume that these...

During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and astandard deviation of $1.10. What proportion of the households spent between $5.00 and $9.00?

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Answer 1

Answer #1

Given X~Normal(mean=8.22, s=1.1)

So P(5<X<9) = P((5-8.22)/1.1 <(X-mean)/s < (9-8.22)/1.1)
=P(-2.93<Z< 0.71)
=0.7595 (check standard normal table)

answered by: jaquan

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Answer 2

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