Statistics and Probability Test

The difference between independent and dependent events is:

• Independent events always occur together, while dependent events never do.

• Independent events do not affect each other, while dependent events do.

• Independent events require a sample space, while dependent events do not.

• Independent events are impossible, while dependent events are certain.

A coin is tossed and a die is rolled. What is the probability of tossing heads and rolling either a 5 or 6?

• 1/3

• 1/6

• 1/12

• 1/2

A bag contains 3 red lollipops and 4 blue lollipops. What is the probability of randomly picking two blue lollipops if the first is not replaced?

• 3/14

• 1/2

• 2/7

• 5/21

Daphne flips a coin four times. What is the probability that it lands on tails all four times?

• 1/16

• 1/8

• 1/4

• 1/32

A bag contains 4 black, 5 pink, and 2 blue marbles. Cara randomly draws a marble out of the bag, keeps it, and then draws out another marble. What is the probability that she draws a pink and then a black?

• 2/11

• 5/99

• 4/99

• 5/22

In a box of 100 batteries, 3 do not work. A product tester randomly picks two batteries to test. What is the probability that both do not work if the first one is not put back after being tested?

• 3/100 or 0.03

• 3/330 or 1/110

• 6/10000 or 0.0006

• 3/99 or 1/33

You are taking a quiz with two multiple-choice questions. Each question has four answer choices. If you randomly guess the answer to each question, what is the probability that you get both questions right?

• 1/16

• 1/8

• 1/4

• 1/2

The mean of the numbers 4, 7, 9, and x is 8. What is the value of x?

• 8

• 12

• 6

• 10

The median of the data set 12, 15, 18, x, 25 is 18. What is the value of x?

• 18

• 12

• 15

• 25

The mode of the numbers 3, 5, 7, 3, x is 3. What could x be?

• 3

• Any number except 3 (e.g., 5, 7, etc.)

• 1

• 0