Intro to Probability

What is probability?

• Rolling a bunch of dice

• The likelihood of an event happening

• The likelihood of an event not happening

• Playing a skill-based game

Probability is expressed as a number between what two numbers

• Probability can be any number

• 1 and 2

• 0 and 1

• 0 and 10

The complement of an event is what

• Something nice that you say

• The likelihood of an event happening

• The likelihood of an event not happening

• Spinning spinners

Probability (event) + Probability (complement) =

• 0

• Infinity

• 100

• 1

Find the Probability:

P (even number)

• 1/2

• 1/8

• 1/4

• 0

Find the Probability:

P (9)

• 1/2

• 1/8

• 1/4

• 0

Find the Probability:

P (1 or 5)

• 1/2

• 1/8

• 1/4

• 0

Find the Probability:

P (2)

• 1/2

• 1/8

• 1/4

• 0