Z Scores and Probability: The American Cancer Society has stated that a 25-year-old man who smokes a pack of cigarettes a day gives up, on average,...
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Z Scores and Probability: The American Cancer Society has stated that a 25-year-old man who

smokes a pack of cigarettes a day gives up, on average, 5.5 years of life. Assuming that the number of years lost is normally distributed with mean 5.5 and standard deviation 1.5, find the probability that a decrease in life of such a man is

 

a.) Less than 2 years

b.) More than 8 years

c.) Between 4 and 7 years


Can you add a curve to illustrate the above points? It helps me visualize how the answer was obtained, if possible.

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