Probability Basics

An outcome with the probability of 19/20 would be described as _.

• likely

• unlikely

• equally likely as not

• certain

What is the definition of the complement of a probability of an event happening?

• there is no such thing as the complement of probability

• the same as the probability of the event happening

• double the probability of the event happening

• the probability of the event not happening

What is the definition of sample space?

• the set of all possible outcomes of a simple or compound experiment

• the space in which you write a probability answer

• the set of all the prime numbers

• the space between the probability of 0 and 1

What is the definition of "likely" when dealing with probability?

• having the probability less than 1

• the outcome that is the most popular

• having the probability greater than 1/2

• having the probability less than 1/2

What is the definition of "unlikely" when dealing with probability?

• having a probability of less than 1/2

• having a probability of more than 1/2

• having a probability equal to 1/2

• having a probability less than 1

A bag has 3 red marbles, 2 blue and 4 yellow. What is the probability of pulling a red? (Reduce the fraction!)

• 3/10

• 3/9

• 1/9

• 1/3

What is the probability of getting any letter that is not A?

• 6/8

• 3/4

• 2/8

• 1/4

What is the probability that a student plays an instrument?

• 11/20 = .55

• 10/20 = .5

• 9/20 = .45

• 8/20 = .4

What is the probability you select a person who would pick chocolate?

• .398

• .342

• .26

• .686

What is the probability you choose a child that likes Vanilla?

• .239

• .082

• .314

• .286