NSAA NSAA Mathematics - Statistics and Probability

Question 1

A bag contains 4 red, 3 blue, and 5 green balls. What is the probability of drawing a blue ball?

Accepted Answer

1/4

Answer

1/3

Answer

1/5

Answer

1/6

Question 2

The mean of five numbers is 8. If four of the numbers are 6, 7, 9, and 10, what is the fifth number?

Accepted Answer

8

Answer

6

Answer

7

Answer

9

Question 3

A die is rolled twice. What is the probability of getting a 6 on both rolls?

Accepted Answer

1/36

Answer

1/6

Answer

1/12

Answer

1/3

Question 4

The median of the data set {3, 7, 9, 2, 5} is:

Accepted Answer

5

Answer

7

Answer

9

Answer

3

Question 5

What is the variance of the set {2, 4, 6} given mean = 4?

Accepted Answer

4

Answer

2

Answer

8

Answer

16

Question 6

If events A and B are mutually exclusive, what is P(A or B)?

Accepted Answer

P(A) + P(B)

Answer

P(A) × P(B)

Answer

P(A) + P(B) - P(A∩B)

Answer

P(A) / P(B)