Probability Types

An event that is not affected by previous events.

Two marbles are drawn from a container in such a way that the first marble drawn is replaced before selecting the second marble. Does the outcome of the first draw affect the outcome of the second?

• Yes

• No

A box contains 5 purple marbles, 3 green marbles and 2 orange marbles. Draws are made without replacement. Find P(both marbles are purple)

• 2/9

• 1/3

• 1/2

• 1/4

What is P(5)?

• 3/1

• 3/4

• 1/4

• 1

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

You roll a fair six-sided die. What is the probability that the die shows a one or a six?

Each of the numbers from 1 to 60 is written on a card and placed in a bag. If one card is drawn at random, what is the probability that the number is a multiple of 2 or a multiple of 3?

A bag contains 26 balls with letters written on each, one ball for each letter of the alphabet. What is the probability that when you get a ball at random, the letter written on the ball is either a vowel or one of the first five letters of the alphabet?

• 5/26

• 3/13

• 4/13

• 2/26

Ian wants to wear colored shirts. He has a 15 shirts in the closet. Five of these are blue, four are red, and the rest are of different colors. What is the probability that he will wear a blue or a red shirt?

• 2/5

• 3/5

• 4/5

• 1

If the probability that tomorrow will be a sunny day is 0.78, find the probability that tomorrow will not be sunny.

• 0.12

• 0.22

• 0.39

• 0.78