CEE 202 Homework 7 solutions

# Smaller z value is located to the left side of larger

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Unformatted text preview: 7000 psi and a standard deviation of 550 psi. Manufacturer Rivet Runs Through It (RT) produces rivets with a mean breaking strength of 6500 psi and a standard deviation of 300 psi. a) 10 points Which manufacturer will produce the lowest number of defective rivets? RR: ZRR = (5000 ­7000)/550 =  ­3.636 p(Z< ­3.636) = 1.38*10 ­4 used normsdist RT: ZRT = (5000 ­6500)/280 =  ­5.357 p(Z< ­5.357) = 4.23*10 ­8 used normsdist 2 3/6 CEE 202 – Engineering Risk & Uncertainty Spring 2011 (Bond) Homework 7 Distributions Aplenty RT has the lower fraction. Therefore it would produce the lowest number of defective rivets Alternative solution It can be also found by comparing ZRR and ZRT. Smaller Z value is located to the left side of larger Z value which means that the area under the CDF is less. b) 9 points If the camping gear maker buys 80% of its rivets from the...
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## This document was uploaded on 03/06/2014 for the course CEE 202 at University of Illinois, Urbana Champaign.

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