Basic Probability 7.6E

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 is the probability of an event that is certain to happen?

Back

1 (or 100%)

Front

What is the probability of an impossible event?

Back

0 (or 0%)

Front

How do you calculate the probability of a single event?

Back

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

Front

If a jar contains 2 pink, 6 red, and 4 blue marbles, what is the total number of marbles?

Back

12 marbles (2 + 6 + 4 = 12)

Front

What is the probability of picking a red or blue marble from the jar?

Back

5/6 (5 favorable outcomes: 6 red + 4 blue out of 12 total)

Front

What is the complement of an event?

Back

The complement of an event is the probability that the event does not occur.

Front

If a spinner has 4 colors: red, blue, green, and purple, what is the complement of spinning purple?

Back

Not purple (which includes red, blue, and green)

Front

What is the probability of picking a quarter from a bag containing 5 quarters, 2 dimes, and 4 pennies?

Back

5/11 (5 quarters out of 11 total coins)

Front

What is the probability of rolling a die and landing on a 2?

Back

1/6 (1 favorable outcome out of 6 possible outcomes)