Probability of One Event

Melissa rolled a number cube that has sides labeled 1 to 6. What is the probability that she rolled a 2 or a 3?

• 1/6

• 1/3

• 1/2

• 3/4

Rolling an even number on a number cube is

• Impossible

• Certain

• Equally Likely

• Likely

A list of all possible outcomes of a trial is called the ___________ of that trial.

• experiment

• sample space

• Event

• range

The extent to which something is likely to occur is known as - 

• sample space

• an event

• probability

• data

The likelihood that a single, specific event will occur is called - 

• sample space

• compound probability

• a complement

• simple probability

The number of ways an event can occur divided by the total number of outcomes is known as - 

• an event complement

• experimental probability

• an event

• theoretical probability

How do we determine which event is most likely to occur?

• The event has the closest improper fraction to 1

• The event has the closest proper fraction to 1/2

• The event has the closest proper fraction to 0

• The event has the closest proper fraction to 1

In probability theory, the sum of an event (A) occurring and the same event NOT occurring (not A) is always - 

• 0

• based on the sample space

• variable

• 1

Which of the following expressions would be used to calculate the complement of an event occurring?

• P(event) - 1

• P(event 1) x    P(event 2)

• P(event)/possible outcomes

• 1 - P(event)

P(A) + P(not A) = 1

• True

• False