Probability and Complements

What is the probability of flipping a coin 20 times and landing on heads 11 times?

• P = 1/10

• P = 11/20

• P = 9/20

• P = 10/20

What is the complement of flipping a coin 20 times and landing on heads 11 times?

• P' = 1/10

• P' = 11/20

• P' = 9/20

• P' = 10/20

What is the probability of it snowing 3 days out of the week?

• P = 4/7

• P = 2/7

• P = 5/7

• P = 3/7

What is the complement of it snowing 3 days out of the week?

• P' = 4/7

• P' = 2/7

• P' = 5/7

• P' = 3/7

What is the probability of choosing a red marble if there are 8 red marbles in a jar of 15?

• P = 3/15

• P = 7/15

• P = 8/15

• P = 15/8

What is the complement of choosing a red marble if there are 8 red marbles in a jar of 15?

• P' = 3/15

• P' = 7/15

• P' = 8/15

• P' = 15/8

How likely are you to roll a 1 on a regular die?

• P = 2/6

• P = 3/6

• P = 5/6

• P = 1/6

How likely are you to NOT roll a 1 on a regular die? (Complement)

• P' = 2/6

• P' = 3/6

• P' = 5/6

• P' = 1/6

How likely are you to choose a yellow marble out of a jar, if there are 6 blue, 2 red, and 4 yellow?

• P = 4/10

• P = 1/3

• P = 2/12

• P = 6/12

How likely are you to roll an even number of a regular die?

• P = 2/6

• P = 1/2

• P = 1/3

• P = 2/3