1)If X is a binomial random variable with n = 8 and p = 0.6, what is the probability that X is equal to 4?

Select one:

a.0.275.

b.0.232

c.0.324.

d.0.500.

2)In a set of 50 purchasing transactions, two transactions violated (V) company procurement policies and the remaining forty-eight complied (C) with company policies. An auditor randomly selects four of the 50 transactions without replacement, and classifies each as violated (V) or complied (C). Which of the following is NOT an elementary event for this experiment?

Select one:

a.(V, C, V, V).

b.(C, C, C, C).

c.(V, C, V, C).

d.(C, V, C, C).

3)Let Z be a normal random variable with mean 0 and standard deviation 1. Use the normal tables to find P(Z > 2.4).

Select one:

a.0.4918.

b.0.4793.

c.0.0082.

d.0.0918.

4)It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is:

Select one:

a.75.

b.189.

c.74.

d.25.