Intro to Probability

Intro to Probability

What is probability?

Probability is...

• A ratio comparing what you want to happen with all possible outcomes

  
  

• # of desired outcomes

  # of possible outcomes

Multiple Choice

Probability is….

• The chance that some event will occur

• A game that involves betting

• A guarantee

Multiple Choice

A standard number cube is rolled. What is the probability it lands on a 2 or 5?

• 1/6

• 1/4

• 1/2

• 1/3

Multiple Choice

A standard number cube is rolled. What is the probability it lands on a number greater than 2?

• 2/3

• 1/3

• 3/4

• 5/6

Multiple Choice

A standard number cube is rolled. What is the probability it lands on a number less than 3?

• 1/2

• 1/6

• 1/3

• 1/4

Multiple Choice

Multiple Choice

You write the letters of GEOMETRY on pieces of paper and put them in a bag. What is the probability of randomly choosing an E? Write as ratio and percent.

• 3/8

• 1/4

• 8/26

• 8