Let the Lifetime of a New Jet Ski Be Represented

question 67

Multiple Choice

Let the lifetime of a new Jet Ski be represented by a lognormal variable, Y = e^X where X is normally distributed. Let the mean of the lifetime of the Jet Ski be six years with a standard deviation of three years. What proportion of the Jet Skis will last less than seven years?

• A) 0.2877
• B) 0.3707
• C) 0.6293
• D) 0.7131

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