Normal Distribution

Feb 3rd, 2012
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5 Homework problems on Normal distribution, Head shot on 1. When Population Proportion is given 2. Binomial approximation to normal 3. Sample size is given 4. To find Less than, greater than, between

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Q1.The average thickness of books on a library shelf is 8.3 centimeters. The standard deviation is 0.6 centimeter. If 20% of the books are oversized, find the minimum thickness of the oversized books on the library shelf. Assume the variable is normally distributed. AnsValue of z to the cumulative probability above of 0.20 from normal table is 0.84P( x-u/ (s.d/sqrt(n) ) > x - 8.3/ (0.6/sqrt(1) ) = 0.8That is, ( x - 8.3/ (0.6/sqrt(1) ) = 0.84--> x = 0.84 * 0.6/sqrt(1) + 8.3 = 8.804Q2.The average repair cost of a microwave oven is $55, with a standard deviation of $8. The costs ar

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