MATH losted by ALEKS Corp. Section 6 2 Homework 1 11 2 11 3 11 4 | 61|-7/ 8 9911
ID: 3334437 • Letter: M
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MATH losted by ALEKS Corp. Section 6 2 Homework 1 11 2 11 3 11 4 | 61|-7/ 8 9911 10 1 Previous 10 Next Next Question 5 of 12 (1 point) 6.2 Section Exercise 18 (calc) The average charitable contribution itemized per income tax return in Pennsylvania is $792. Suppose that the distribution of contributions is normal with a standard deviation of $92. Find the limits for the middle 40% of contributions. Use a graphing calculator and round the answers to two decimal places. Check So Guided Link to Ta For Source:IRS,Statistics of Income Builletin. The limits for the middle 40% of contributions are and Save fExplanation / Answer
P(X < -x) = 0.3, P(X < x) = 0.7
P(Z < (-x - 792)/92) = 0.3, P(Z < (x - 792)/92) = 0.7
Z = +/- 0.52
(-x - 792)/92 = -0.52, (x - 792)/92 = 0.52
(-744.16, 839.84)
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