a.) If a student randomly guesses at 20 multiple-choice
questions, find the probability that the student gets exactly four
correct. Each question has four possible choices.
0.190
0.162
0.085
0.218
b.) 80% of members of a club consume alcoholic beverage. Of
14 members are randomly selected what is the probability that all
of them drinks alcohol beverage?
0.044
0
1
0.8
c.) A school is sending 12 children to a camp. If 20% of
the children in the school are first graders, and the 12 children
are selected at random from among all 6 grades at the school, find
the mean and variance of the number of first graders chosen?
d.) At a particular hospital, 40% of staff are nurse
assistants. If 12 staff members are randomly selected, what is the
probability that exactly 4 are nurse assistants?