Simple Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1.

Front

What does it mean if an event has a probability of 0?

Back

It means the event is impossible and will not happen.

Front

What does it mean if an event has a probability of 1?

Back

It means the event is certain and will definitely happen.

Front

How do you calculate the probability of an event?

Back

Probability = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

If there are 3 red blocks and 2 blue blocks, what is the probability of choosing a red block?

Back

P(red) = 3/(3+2) = 3/5.

Front

What is the probability of selecting a brown candy from a bowl with 2 brown candies out of 20 total candies?

Back

P(brown) = 2/20 = 1/10.

Front

If a bag contains 4 blue marbles and 6 red marbles, what is the probability of pulling out a blue marble?

Back

P(blue) = 4/(4+6) = 4/10 = 2/5.

Front

What is the total number of different outfits Joleen can create with 6 tops, 3 shorts, and 4 pairs of sandals?

Back

Total outfits = 6 * 3 * 4 = 72.

Front

If a box has 3 limes, 5 grapes, and 2 oranges, what is the probability of choosing a fruit that is NOT lime?

Back

P(NOT lime) = (5+2)/(3+5+2) = 7/10.

Front

What is the probability of an event that is unlikely to happen?

Back

An unlikely event has a probability less than 0.5.