IB App Probability Review

There are 4 black marbles and 2 white marbles in a bag. What is the probability of choosing a black marble, not replacing it, and then choosing white.

• 4/15

• 3/17

• 2/5

• 2/19

Ricardo has the spinner pictured here and a bag of marbles filled with 2 red marbles, 3 green marbles, and 3 blue marbles. What is the probability that Ricardo spins red on the spinner and picks a red marble out of the bag?

• 1 ⁄ 16

• 1 ⁄ 2

• 1 ⁄ 4

• 1 ⁄ 8

100% , sure

• certain

• likely

• unlikely

• uncertain

Shamar can hit a target with a baseball 12 times out of 18 total throws. Based on that rate, what is the approximate probability he will hit the target on his next throw?

• 12%

• 18%

• 50%

• 67%

Achilles rolled a number cube, labeled 1 through 6, 200 times and recorded each of his results. About how many times could Achilles expect to roll a 3 or 4?

• 35

• 70

• 100

• 130

McKayla flipped a coin 150 times. How many times could McKayla expect the coin to land on tails?

• 25

• 50

• 75

• 100

The tree diagram shows the outcomes of rolling a die and flipping a coin.  
How many total outcomes are there?  

• 6

• 12

• 24

• 36

Which shows the sample space for flipping two coins?

• H, T

• HH, HT, TH, TT

• HH, TT

• Dime, Nickel

What is the probability: Someone buys a lottery ticket and win the jackpot.

• Certain

• Likely

• Unlikely

• Impossible

What is the probability that you will get plain crust with ham on your pizza?

• 1/8

• 1/₂

• 1/₁₀

• 2/₁₀