Probability and Counting Marbles

The video tutorial explains how to calculate probabilities using a jar of marbles. It covers setting up the sample space, calculating the probability of drawing a red marble, a non-red marble, a marble with the number two, a blue marble with the number one, and an even-numbered marble. Each probability is simplified and expressed in fraction, decimal, and percentage forms.

What is the total number of marbles in the jar?

• 30

• 18

• 20

• 24

How many red marbles are there in the jar?

• 10

• 6

• 8

• 12

What is the probability of drawing a red marble?

• 1/4

• 1/3

• 1/6

• 1/2

How many marbles are not red?

• 18

• 16

• 12

• 10

What is the probability of drawing a marble that is not red?

• 3/4

• 2/3

• 1/3

• 1/2

How many marbles have the number two on them?

• 4

• 1

• 2

• 3

What is the probability of drawing a marble with the number two?

• 1/8

• 1/6

• 1/4

• 1/3

How many blue marbles have the number one on them?

• 4

• 3

• 2

• 1

What is the probability of drawing a blue marble with the number one?

• 1/6

• 1/8

• 1/24

• 1/12

What is the probability of drawing a marble with an even number?

• 2/3

• 1/4

• 1/3

• 1/2