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For itemized tax returns in the $60,000-$75,000 income group for the most recent year reported, the average charitable contribution was $1935. Assume a normal distribution and a standard deviation of $400.

a. For a randomly selected household from this income group, what is the probability that the household made charitable contributions of at least $1600?

b. For a randomly selected household from this income group, what is the probability that the household made charitable contributions of between $2200 and $2400?

c. What level of contributions was exceeded by only 20% of the itemized returns in this income group?

d. What level of contributions was exceeded by 40% of the itemized returns in this income group?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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