5. If A and B are mutually exclusive events with P(A) = 0.65, P(B) = 0.25, then P(A|B) =*

.0944

.5400

0.000

.0900

6. The variance of a sample was reported to be 110. The report indicated that (x- x )^2 = 8800. What is the sample size?*

80

85

81

89

7. A unfairly weighted coin is flipped 9 times. If the probability of obtaining a tail when the coin is flipped is only .2, state the probability of obtaining exactly 3 tails.*

.1990

.1751

.1573

.1762

8. Two events are mutually exclusive*

if their intersection is 1.

if their intersection is .5

if they have no sample point in common

if most of their sample points are in common.

9. In statistical experiments, each time the experiment is repeated*

the same outcome must occur.

the same outcome cannot occur again.

A different outcome must occur.

A different outcome might occur.

10. If electricity power failures occur according to a Poisson distribution with an average of 4 failures every twenty weeks, calculate the probability that there will not be more than one failure during a particular week.*

.9934

.9824

.9724

.9634

11. The union of events A and B is the event containing all the sample points belonging to*

B or A

A or B

A or B or both

A or B, but not both

12. An experiment consists of determining the speed of automobiles on a highway by the use of radar equipment. The random variable in this experiment is a*

discrete random variable

complex random variable

simplex random variable.

continuous random variable

13. A random variable that can assume only a finite number of values is referred to as a(n)*

infinite sequence.

finite sequence

discrete random variable

discrete probability function

14. Which of the following statements is always true?*

-1 P(Ei) 1

P(A) + P(B) = 1

P 1

P(A)=1-P(A complement)

15. Which of the following provides a measure of central location for the data?*

Standard deviation

Range

Variance

Mean

16. The hourly wages of a sample of five individuals is given below (use this table to answer a to e):

a. The mean hourly wage is*

19.8

18.8

20.5

17.8

b. The standard deviation of the wage is*

8.7

7.6

6.7

8.5

c. The 75th percentile*

25

27

26

25.5

d. The 25th percentile*

12

11

13

10

e. The median wage is*

21

20

25

12