Algebra 1 - Probability

Front

What is probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1, or as a percentage.

Front

How can probability be expressed?

Back

Probability can be expressed as a fraction, a decimal, or a percent.

Front

What is the formula for calculating probability?

Back

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

Front

If a jar has 10 green marbles, 7 red marbles, and 3 blue marbles, what is the total number of marbles?

Back

Total number of marbles = 10 + 7 + 3 = 20.

Front

What is the probability of pulling a red marble from a jar with 7 red marbles out of 20 total marbles?

Back

Probability = 7/20.

Front

In a bag with 5 quarters, 2 dimes, and 4 pennies, what is the probability of picking a quarter?

Back

Probability = 5/11.

Front

What is the probability of rolling a 7 on a single die?

Back

Probability = 0 (since a standard die has numbers 1-6).

Front

If a jar contains 2 pink, 6 red, and 4 blue marbles, what is the probability of picking a red or blue marble?

Back

Probability = (6 red + 4 blue) / (2 pink + 6 red + 4 blue) = 10/12 = 5/6.

Front

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

Back

It means the event is certain to occur.

Front

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

Back

It means the event is impossible and will not occur.