Mastering Probability Fractions

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a fraction or percentage.

Front

How do you calculate the probability of an event?

Back

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

Front

What is a favorable outcome in probability?

Back

A favorable outcome is the specific result of an event that we are interested in.

Front

What is the total number of jelly beans in a jar containing 7 red, 8 yellow, and 5 green jelly beans?

Back

Total = 7 + 8 + 5 = 20 jelly beans.

Front

What is the probability of choosing a yellow jelly bean from a jar of 20 jelly beans?

Back

Probability = 8/20 or 2/5.

Front

What is a raffle ticket?

Back

A raffle ticket is a ticket that gives the holder a chance to win a prize in a lottery.

Front

If there are 20 raffle tickets and 4 are winning, what is the probability of picking a winning ticket?

Back

Probability = 4/20 or 1/5.

Front

What is the probability of rolling an even number on a standard die?

Back

Probability = 3/6 or 1/2 (even numbers are 2, 4, 6).

Front

How many boys are in a class of 15 students with 9 girls?

Back

There are 6 boys in the class.

Front

What is the probability of randomly selecting a boy from a class of 15 students?

Back

Probability = 6/15 or 2/5.