88. The authors of a paper from which the data in Exercise 25 of Chapter 1 was
Question:
88. The authors of a paper from which the data in Exercise 25 of Chapter 1 was extracted suggested that a reasonable probability model for drill lifetime was a lognormal distribution with m 4.5 and s .8.
a. What are the mean value and standard deviation of lifetime?
b. What is the probability that lifetime is at most 100?
c. What is the probability that lifetime is at least 200? Greater than 200?
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Related Book For 
Modern Mathematical Statistics With Applications
ISBN: 9780534404734
1st Edition
Authors: Jay L Devore
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