EX. 26) A Population consists of 15 items, 10 of which are
acceptable.
In a sample of four items, what is the probability that exactly three are
acceptable? Assume the samples are drawn without replacement.
Chapter 7:
Ex 4) According to the insurance institute of America, a family of
four spends between $400 and $3,800 per year on all type of
insurance. Suppose the money spent is uniformly distributed between
these amounts.
a. What is the mean amount spent on insurance?
b. What is S.D of the amount spent?
c.
If we select a family at random, What is the probability they
spend less than $2,000 per year on insurance per year?
d.
What is the probability a family spends more than $3,000 per
year?
EX.10)The mean of a normal probability distribution is 60; the
standard deviation is 5.
a) About what percent of the observations lie between 55 and 65?
b) About what percent of the observations lie between 50 and 70?
c) About what percent of the observations lie between 45 and 75?
Ex 14) A normal population has a mean of 12.2 and a standard
deviation of 2.5