Intro to Probability

What does the probability of an event tell us?

• How often something happens.

• How likely an event is to happen.

• Whether an event is certain or impossible.

• The average outcome of an experiment.

On a probability line, what does a probability of 0.5 (or 1/2) signify?

• The event is impossible.

• The event is certain to happen.

• The event is just as likely to happen as it is not to happen.

• The event is unlikely to happen.

What is the probability of rolling a specific number (e.g., a 3) on a standard six-sided die?

• 1/2 (50%)

• 1/6 (approximately 16.7%)

• 1 (100%)

• 0 (0%)

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A spinner has 16 equally sized sectors. 5 sectors are blue, and 11 sectors are yellow. What is the probability of spinning a blue sector?

• 5/11

• 11/16

• 5/16

• 1/16

A bag contains 3 green marbles, 7 yellow marbles, and 1 white marble. If you pull out one marble at random, what is the probability of it being white?

• 1/11

• 3/11

• 7/11

• 1/3