GRE - Graduate Record Examinations Probability and Statistics Concepts Questions and Answers

Question 1

A bag contains 6 red, 4 blue, and 5 green marbles. If one marble is drawn at random, what is the probability that the marble is NOT blue?

Accepted Answer

11/15

Answer

4/15

Answer

1/3

Answer

2/3

Question 2

A company with 8 junior developers needs to form a team of 3 to send to a conference. How many different teams of 3 can be formed?

Accepted Answer

56

Answer

336

Answer

24

Answer

120

Question 3

The mean (arithmetic mean) of the five numbers {7, 3, 11, x, 15} is 9. What is the median of this set of numbers?

Accepted Answer

9

Answer

11

Answer

8

Answer

7

Question 4

Which of the following sets of numbers has the smallest standard deviation?

Accepted Answer

{24, 25, 25, 25, 26}

Answer

{5, 15, 25, 35, 45}

Answer

{0, 0, 25, 50, 50}

Answer

{20, 20, 20, 30, 30}

Question 5

A standard six-sided die is rolled and a card is drawn from a standard 52-card deck. What is the probability of rolling a 4 and drawing a Jack?

Accepted Answer

1/78

Answer

1/13

Answer

1/6

Answer

2/39

Question 6

In a group of 200 students, 100 play a sport, 80 are in a club, and 30 both play a sport and are in a club. What is the probability that a student chosen at random plays a sport OR is in a club?

Accepted Answer

3/4

Answer

9/10

Answer

1/2

Answer

2/5