Answer Happy

Question 2 [25]
Suppose that the latest census indicates that for every 10 young
people available to work only 4 are employed. Suppose a random
sample of 20 young graduates is selected.
Required:
a) What is the probability that they are all employed?
b) What is the probability that none of them are employed?
c) What is the probability that at least four are employed?
d) What is the probability that at most fifteen are
employed?
e) What is the probability that the number of young graduates
who are employed is greater than ten but less than fifteen?
f) What is the expected number of graduates who are not
employed?
g) What is the standard deviation for the number of graduates
who are not employed?