Let the lifetime of a new Jet Ski be represented by a lognormal variable, 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 nine or more years?
A) 0.1379
B) 0.1587
C) 0.8413
D) 0.8621

Question

Let the lifetime of a new Jet Ski be represented by a lognormal variable,  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 nine or more years?
A) 0.1379 
B) 0.1587 
C) 0.8413 
D) 0.8621

Quizplus · Accepted Answer

The Answer of Let the lifetime of a new Jet Ski be represented by a lognormal variable,  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 nine or more years?
A) 0.1379 
B) 0.1587 
C) 0.8413 
D) 0.8621

Let the Lifetime of a New Jet Ski Be Represented