The authors of the paper from which the data in Exercise 1.27 was extracted suggested that a

Question:

The authors of the paper from which the data in Exercise 1.27 was extracted suggested that a reasonable probability model for drill lifetime was a lognormal distribution with and .

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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