The National Vaccine Information Center estimates that 89.1% of
Americans have had chickenpox by the time they reach
adulthood.
(a) Calculate the probability that exactly 97 out of 100 randomly
sampled American adults had chickenpox during childhood.
(b) What is the probability that exactly 3 out of a new sample of
100 American adults have not had chickenpox in their
childhood?
(c) What is the probability that at least 1 out of 8 randomly
sampled American adults have had chickenpox?
(d) What is the probability that at most 3 out of 8 randomly
sampled American adults have not had chickenpox?
We now consider a random sample of 140 American adults.
(e) How many people in this sample would you expect to have had
chickenpox in their childhood?
And with what standard deviation?
(f) What is the probability that 112 or fewer people in this sample
have had chickenpox in their childhood?
Get Answers For Free
Most questions answered within 1 hours.