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Unformatted text preview: ENME392 Spring 2012 Homework 5 Solutions Total number of points: 100 Assignment: 1. Chapter 8 : 8.22 (5 pts) (a) the mean and standard deviation of the sampling distribution g G = . cm G = u = u 6.9 = . = 1.38 . cm (b) The number of sample means that fall between 172.5 and 175.8 cm: 172.5 < < 175.8 = g G G = 172.5 174.5 1.4 = 1.4492, < 1.4492 = 0.0668 = g G G = 175.8 174.5 1.4 = 0.7491, < 0.7491 = 0.8159 172.5 < < 175.8 = 0.8159 0.0668 = . 200 172.5 < < 175.8 = 200 0.7491 = 149.82 mean samples (c) the number of sample means falling below 172.0 cm. < 172 = < 172 174.5 1.4 = < 1.8116 = 0.0359 200 < 1.8116 = 200 0.0359 = 7.18 samples 2. Chapter 8 : 8.24 (10 pts) Sample size : n = 36 Mean: g G = 40 ohms SD : = 2 ohms Sample S.D. : G = u = u 2 = = The probability that a random sample of 36 resistors will have a combined resistance of 1458...
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This note was uploaded on 04/05/2012 for the course ENME enme392 taught by Professor Cukier during the Spring '10 term at Maryland.
 Spring '10
 Cukier

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