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chapter04s_ls - Select the Example 3 worksheet The...

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Lecture Suggestions - Supplement to Chapter 4 Example 3: Service Life - Normal Distribution 1. 2. 3. Specify the time T = 7 Point out on the graph that the vertical red line corresponds to T and the probability of wearout before T is under the normal curve to the left of the red line and the probability of wearout after T is under the normal curve to the right of the red line. The actual probabilities, along with z (the number of standard deviations from the mean), are also computed to the left of the graph. You may want to use the spinner button beside T to demonstrate the probabilities of wearout for different values of T. 4. Trail and error approach: As you make the changes below, watch P(failure before T), you want it to be equal to .1
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Unformatted text preview: Select the Example 3 worksheet. The following data has been entered: Enter data , service life mean = 6 years and standard deviation = 1 year (both given). Parts a and b: you want to find P(failure before T) and P(failure after T) for T=7. Part c: you want to find the value for T where P(failure before T) = .10. Set ∆ T = 1, use spinner button to find that necessary T is between 4 and 5 Set ∆ T = .1, use spinner button to find that necessary T is between 4.7 and 4.8 Set ∆ T = .01, use spinner button to find that necessary T is closest to 4.72....
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