Simple Probability and Its Complement

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

P(not A) = 
*Remember to simplify.*

• 6/8

• 3/4

• 2/8

• 1/4

The chart below represents the number of marbles in a jar.
P(green) = 

• 5/19

• 10/28

• 5/14

The cafeteria is serving three kinds of sandwiches:  tuna (T), chicken, (C), and peanut butter (P).  They are also serving a choice of two drinks:  milk (M) or water (W).  Which shows the CORRECT Sample Space List of possible combinations?

• TW, CW, PW

• TW, TM, TC, CW, PW

• TW, TM, CW, CM, PW, PM

• TCP, MW

How likely are you to roll a 1 on a regular die?

• P = 2/6

• P = 3/6

• P = 5/6

• P = 1/6

• F

• G

• H

• J

• 1/4, because the probability of renting a drama is 3/4.

• 3/4, because the probability of renting a drama is 1/4.

• 4/5, because the probability of renting a drama is 1/5.

• 1/5, because the probability of renting a drama is 4/5.

How likely are you to NOT roll a 1 on a regular die? (Complement)

• P' = 2/6

• P' = 3/6

• P' = 5/6

• P' = 1/6

What is the probability of spinning a purple?

• 1/4

• 1/8

• 2/4

• 5/8

What is a Complement in probability?

• Saying-- You look very nice today.

• Probability of an event happening

• Probability of an event NOT happening

• Not here