Simple Probability and Their Complement

Simple Probability

by Blake Owen

​Simple Probability

​Ratio of desired outcomes to total number of outcomes.

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​What is the probability of spinning an even number (as a fraction)?

Multiple Choice

A number cube is rolled. What is the probability of rolling a 6?

• 1/6

• 6/6

• 3/6

• 2/3

Multiple Choice

A number cube is rolled. What is the probability of rolling an odd number?

• 1/2

• 1/6

• 1/3

• 6/6

​Complement

The probability of an event not happening.

• ​Written as a ratio of undesired outcomes to total outcomes

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​What is the complement of spinning a diamond?

Multiple Choice

What is the complement of choosing a marble with stripes?

• 2/6 = 1/3

• 4/6 = 2/3

• 1/6

• 6/6 =1

Multiple Choice

The spinner shown is spun. What is the probability of not spinning a 6?

• 4/7

• 3/7

• 6/7

• 1/7

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