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.