Probability Review

If I flip a coin 10 times how many times should I get heads?

• 1

• 10

• 3

• 5

A bag has 10 marbles:  3 blue, 2 yellow, 4 red, and 1 purple.
What is the probability of picking out a purple marble?

• 3/10

• 1/10

• 4/10

A spinner has 8 sections: 2 purple, 2 yellow, 3 blue, and 1 red.
What is the probability of spinning and landing on a color that is not yellow?

• P(not yellow) = 6/8

• P(not yellow) = 2/8

• P(not yellow) = 6

The probability of flipping a coin and landing on tails is 1/2.
If you flip the coin 100 times, approximately how many times could you expect to land on tails?

• 50 times

• 100 times

• 200 times

A game involves conducting an experiment and gathering data to find the experimental probability of an event. What is a good first step for finding the experimental probability of an event?

• Make a square to show an area model and then divide the sections in equal sections.

• Determine the outcomes of the event and make a table to record results.

• Multiply the probability of the first event and the probability of the second event.

• Make a table to show results and divide the results in equal amounts according to the outcomes.

A container has 1 blue block and 3 yellow blocks. You want to make the probability of randomly selecting a green block equal to 50%. How many green blocks should you add?

• 1 green block

• 4 green blocks

• 10 green blocks

• 5 green blocks

The game show host asks students to choose a marble at random. What is another way to describe the word random?

• To select based on the color most preferred

• To select all the marbles at one time

• To select the color of marbles least preferred

• To select with no regard to order or preference
  

A dartboard has 4 equal sections, of which 2 are orange.
What is the probability that a dart will land in an orange section?

• 1/2

• 2/4

• 50%

• All of the above

An amusement park has 18 attractions, including 8 arcades.
What is the probability that a randomly selected attraction at this amusement park will be an arcade?

• 8/18

• 4/9

• 44%

• All of the above

What is the probability of picking a green marble, keeping it, then picking another green marble? (leave answer in fraction form in lowest terms)

• 9/49

• 1/7

• 3/14

• 6/42