Calculating Probability of Events

Calculating probability of simple events: If a bag contains 5 red marbles, 3 blue marbles, and 2 green marbles, what is the probability of picking a red marble?

• 3/10 or 3/10

• 2/10 or 2/10

• 5/10 or 1/2

• 4/10 or 4/10

Calculating probability of simple events: If a spinner is divided into 8 equal sections and stops on a section numbered 5, what is the probability of this happening?

• 2/9

• 1/5

• 1/8

• 3/8

A spinner has 6 equal parts. 4 parts are blue and 2 are green. What is the probability that it stops on a green part?

What is the probability of the spinner shown landing on a number greater than 2 but less than 7?

• 1/4

• 3/8

• 1/2

• 1/8

In a standard deck of 52 cards, what is the probability of drawing a heart or a spade?

• 1/2

• 1/4

• 1/3

• 1/16

Probability can be written as a 

• fraction

• decimal

• percent

• all of the above

The letters that form the word ALGEBRA are placed in a bowl. What is the probability of choosing a letter other than “A”? 

• 2/7

• 5/49

• 5/7

• 10/49

What is P(heads)?

• 50%

• 1%

• 25%

• 100%

Calculating probability of simple events: If a deck of cards contains 52 cards, what is the probability of drawing a heart?

• 13/52

• 1/52

• 26/52

• 39/52

Theoretical probability: If a bag contains 4 red balls, 3 blue balls, and 5 green balls, what is the theoretical probability of picking a blue ball?

• 3/5

• 2/12

• 1/10

• 3/12 or 1/4