SOLUTION: The average charitable contribution itemized per income tax return in Pennsylvania is $791. Suppose that the distribution of contributions is normal with a standard deviation of $1

Question 372472: The average charitable contribution itemized per income tax return in Pennsylvania is $791. Suppose that the distribution of contributions is normal with a standard deviation of $111. Find the limits for the middle 70% of contributions?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Go to http://davidmlane.com/hyperstat/z_table.html for a normal calculator to find the interval between which you can find the middle 70%. In the bottom calculator type in 791 for mean and 111 for sd. In the "shaded area" slot type in 0.70. You will get the values 675.9559 and 906.0441.
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