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

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The authors of the article from which the data in Exercise 1.27 was extracted suggested that a reasonable probability model for drill lifetime was a lognormal distribution with μ = 4.5 and σ = .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?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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