Easy Probability

A compound event is..

• an event that directly causes another

• the probability of all the outcomes

• 1 event that creates 2 results

• when 2 or  more independent events work together

The spinner below is spun twice. What is the probability of the arrow landing on a 3 and then on an odd number?

• 1/3

• 1/9

• 2/9

• 2/6

What is the probability of randomly selecting an odd number from the numbers 1 -15?

• 8/15

• 1/2

• 7/15

• 1/8

Twelve students have an equally likely chance of being selected in a drawing at school. Eight are girls and four are boys. What is the probability that a boy will be selected?

• 1/4

• 1/3

• 1/8

• 3/4

A number cube is rolled. What is the likelihood that a number less than or equal to three is rolled?

• unlikely

• equally likely

• likely

• certain

Marty can go to one movie on either Friday or Saturday. His choice of movies includes a comedy or an action movie. Which list shows all of the possible outcomes of one movie on one day?

• Comedy, Friday

  Comedy, Saturday

  Action, Friday

  Action, Saturday

• Comedy, Action

  Action, Comedy

  Friday, Saturday

  Saturday, Friday

• Action, Friday

  Action, Saturday

• Comedy, Friday

  Action, Friday

In a game the player wins if he rolls a 4 on a number cube. If the number cube is rolled 24 times, then what is a reasonable prediction for the number of unsuccessful rolls?

• 5

• 20

• 4

• 24

Which of the following has a certain likelihood of occurring?

• A field goal will be made by the kicker

• There is a 70% of rain on Monday

• Next month has at least 29 days

• A coin will land on either heads or tails

Two coins are flipped. What is the probability that both of the coins land heads up?

• 1/2

• 1/4

• 1/6

• 1

At a school assembly 3 out of the first 10 students were wearing spirit wear. Based on this information, if 400 students were at the assembly, then how many students could be expected to be wearing spirit wear?

• 120

• 40

• 30

• 280