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Intro Stats / AP Statistics
The duration of cigarette smoking has been linked to many
diseases, including lung cancer and various forms of heart disease.
Suppose we know that among men ages 30-34 who have ever smoked, the
mean number of years they smoked is 12.8 with a standard deviation
of 5.1 years. For women in this age group, the mean number of years
in 9.3 with standard deviation of 3.2. Assume that the duration of
smoking is normally distributed.
(4 points) The probability that a man in
this age group have smoked for more than 25 years is
0.0793
0.0084
0.9916
0.9207
(4 points) The probability that a woman
in this age group have smoked for more than 10 but less than 16
years is
0.1972
0.9819
0.5866
0.3949
(4 points) The
99th percentile of duration of cigarette smoking
for men is
2.33
-2.33
24.68
14.32
(4 points) The
15th percentile of duration of cigarette smoking
for women is
1.04
-1.04
12.53
5.97