Probability and Complements

by Judy Riggle

| 10 QuestionsNote from the author:

Probability and it's complement.

1

1

Erica rolls a six-sided number cube once. What is the probability that Erica rolls a 4?

Put your answer in the form of a fraction.

2

1

The complement of an event includes all outcomes that are not the desired outcome. What is the probability of the complement of Erica's roll above? Put your answer as a fraction.

3

1

Sam spins a spinner with 4 equal sections labeled A, B, C, & D. What is the probability the spinner lands on B?

Put your answer in the form of a decimal.

4

1

What is the probability of the complement of Sam not spinning B on the spinner? Put your asnwer in the form of a decimal.

5

1

Nikita went to a sports store to purchase a basketball. In the bin were 7 red, 6 blue, 3 white, and 4 green basketballs. If Nikita were to pick a basketball at random from the bin, what is the probability she will choose a red basketball? Record your answer as a percent.

6

1

What is the complement of Nikita picking a red basketball? Write your answer as a percent.

7

1

What conclusion can be drawn about the relationship between the probability of an event and its complement?

8

1

Rodrigo chooses a book from the box. The box has 12 science fiction books, 16 mystery books and 12 mythology books. If Rodrigo randomly chooses a book from the box, determine the probability that it will NOT be a science fiction book. Write your answer in the form of a decimal.

9

1

A box of multi-color paper clips contains 25 red clips, 15 blue clips, 15 green clips and 20 pink clips. If Roy reaches into the box and pulls out 1 paper clip without looking, what is the probability he will select a red or blue paper clip? Write your answer as a fraction.

10

1

When a coin is flipped, the probability of landing on heads is 1/2 and the probibility of landing on tails is also 1/2. Why is landing on tails the complement of landing on heads?

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