Basics of Probability and Counting

What is the probability of pulling a red marble
out of a jar of marbles that have 10 green marbles, 7 red marbles and 3 blue marbles?

• 1/7

• 7/20

• 7/10

• 3/10

Is the spinner more likely or less likely to land
on green than yellow?

• more likely

• less likely

Which shows the sample space for flipping two coins? 
H = heads, T = tails

• H, T

• HH, HT, TH, TT

• HH, TT

• HH, TT, TT, HH

If we were rolling a dice and recording the number on it, what would the sample space be?

• (1,2)

• (1,2,3,4)

• (1,2,3,4,5,6)

• (1,2,3,4,5,6,7,8)

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

A bag contains 30 pieces of candy. There are 15 grape, 7 cherry, 3 lemon, 5 strawberry. What is the probability of drawing a lemon?

• 3

• 1/10

• 3/10

• 30%

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 probability based on frequency of outcomes during an experiment

•  experimental probability

• fundamental counting principle

• mutually exclusive event

• dependent event

Find the experimental probability of spinning Letter Q.

• 15/15

• 3/10

• 3/50

• 7/10