Probability Practice

Front

What is the probability of an event not occurring?

Back

The probability of an event not occurring is calculated as: P(Event^c) = 1 - P(Event).

Front

If there are 20 total outcomes and 6 favorable outcomes, what is the probability of selecting a favorable outcome?

Back

P(Favorable) = \frac{Favorable\ Outcomes}{Total\ Outcomes} = \frac{6}{20} = 0.3 or 30%.

Front

How do you calculate the probability of selecting a non-red rose from a vase containing 12 red, 5 yellow, and 3 white roses?

Back

P(Not Red) = \frac{Total\ Non-Red\ Roses}{Total\ Roses} = \frac{5 + 3}{12 + 5 + 3} = \frac{8}{20}.

Front

What is the formula for calculating the probability of an event?

Back

P(Event) = \frac{Number\ of\ Favorable\ Outcomes}{Total\ Number\ of\ Outcomes}.

Front

If a spinner has 8 equal sections numbered 1 to 8, what is the probability of landing on a number greater than 2?

Back

P(Number > 2) = \frac{Number\ of\ Favorable\ Outcomes}{Total\ Outcomes} = \frac{6}{8} = \frac{3}{4}.

Front

What does it mean if the probability of an event is 0?

Back

A probability of 0 means that the event cannot occur.

Front

What does it mean if the probability of an event is 1?

Back

A probability of 1 means that the event is certain to occur.

Front

In a bag with 6 pumpernickel, 10 onion, and 9 whole wheat bagels, what is the probability of not selecting an onion bagel?

Back

P(Onion^c) = 1 - P(Onion) = 1 - \frac{10}{25} = \frac{15}{25}.

Front

If a spinner has 4 equal sections numbered 1 to 4, what is the probability of landing on 3?

Back

P(3) = \frac{1}{4}.

Front

What is the probability of rolling a die and getting a number less than 3?

Back

P(Number < 3) = \frac{2}{6} = \frac{1}{3}.