Probability Intro

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 a probability of 0 mean?

Back

A probability of 0 means that the event cannot happen.

Front

What does a probability of 1 mean?

Back

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

Front

How do you calculate the probability of an event?

Back

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

Front

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

Back

Probability = 4/(4+6) = 4/10 = 2/5.

Front

What is the probability of rolling a die and getting an even number?

Back

There are 3 even numbers (2, 4, 6) on a die, so Probability = 3/6 = 1/2.

Front

In a jar with 12 marbles (2 pink, 6 red, 4 blue), what is the probability of picking a blue marble?

Back

Probability = 4/12 = 1/3.

Front

What is the probability of picking a marble that is not red from a jar with 6 red and 4 blue marbles?

Back

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

Front

If you have a standard deck of 52 cards, what is the probability of drawing a heart?

Back

There are 13 hearts in a deck, so Probability = 13/52 = 1/4.

Front

What is the probability of picking a purple marble from a bag that contains no purple marbles?

Back

Probability = 0.