Lesson on Probability

The probability of it raining today is 30%.  What is the probability that it will NOT rain?

• 30%
• 70%
• 100%
• 0%

What is the P(A then A) = _____

• 4/81
• 2/9
• 2/7
• 4/18

What is the P(K then A) = _____

• 1/9
• 2/9
• 2/7
• 0

What is the P(A then B) = _____

• 1/6
• 1/3
• 2/81
• 1/27

How do you find compound probability?

• Multiply your probabilities
• Add your probabilities
• Divide your probabilities
• Subtract your probabilities

What is the P(white, purple) = ___

• 1/12
• 7/12
• 7/5
• 1/24

What is the P(purple, red) = ___

• 1/18
• 6/144
• 1/3
• 1/2

You roll a six sided die. What is the probability of rolling an even number three times in a row? 

• 3/100
• 1/2
• 1/6
• 1/8

A bag contains 5 blue marbles, 4 red marbles, and 3 orange marbles. Mrs. Cox picks one without looking, replaces it and picks another one. What is the probability that she picks two that are not orange? 

• 9/16
• 3/4
• 9/144
• 5/16

P(2 then 5) = 

• 1/6
• 1/12
• 1/36