Probability

If the probability of something is 1, it_______.

• will never happen

• has a 25% chance of happening

• has a 75% chance of happening

• will definitely happen

You have a jar of 20 jellybeans, and 4 are red. Which fraction represents the probability that you will pick a red jellybean out of the jar?

• $\frac{4}{20}$

• $\frac{16}{20}$

• $\frac{20}{4}$

• $\frac{20}{16}$

You have a jar of 20 jellybeans with 4 red beans, and you take out 1 red jellybean. Now, after taking out this bean, what is the new probability that you will pick a red jellybean out of a jar?

• 
  

  $\frac{4}{19}$
  

• $\frac{4}{20}$

• $\frac{3}{19}$

• $\frac{3}{20}$

You have a 1 in 4 chance of winning a game. How would you calculate the probability that you will win 3 times in a row?

• $\frac{1}{4}$

• $3\cdot\frac{1}{4}$

• $\frac{1}{4}+\frac{1}{4}+\frac{1}{4}$

• $\frac{1}{4}\cdot\frac{1}{4}\cdot\frac{1}{4}$

Your teacher puts numbers, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 in a hat and asks you to draw a number. What's the probability that you will draw either a 4 or a 6?

• 
  

  $\frac{1}{12}$
  

• $\frac{2}{12}$

• $\frac{4}{12}$

• $\frac{6}{12}$

Your teacher has the same hat with numbers, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 in it. She wants you to take two turns drawing a number. After the first time you draw, you will put the number back in the hat before drawing again. What are the chances that you will draw 4 two times in a row?

• 
  

  $\frac{1}{36}$
  

• $\frac{1}{6}$

• $\frac{1}{144}$

• $\frac{1}{2}$

You have a bowl with 5 orange, 6 blue, 3 green, 4 red, and 7 yellow candies. What is the probability that you will choose an orange candy out of the bowl?

• 50%

• 60%

• 20%

• 25%

You have the same bowl, with 5 orange, 6 blue, 3 green, 4 red, and 7 yellow candies. You take out an orange candy from the bowl. What is the new probability that you will draw another orange candy?

• 
  

  $\frac{1}{5}$
  

• $\frac{1}{6}$

• $\frac{1}{8}$

• $\frac{5}{24}$

You're playing the ring toss game at a carnival. In one round of the game, you either hit your target and win, or you miss the target and lose. What is the probability you will win one round of the game?

• 50%

• 
  

  $\frac{1}{2}$
  

• 0.5

• all of the above

You play three rounds of the same ring toss game. Each round, you either hit your target and win or miss your target and lose. What is the probability that you will win three rounds in a row?

• 
  

  $\frac{1}{8}$
  

• $\frac{3}{2}$

• $\frac{1}{3}$

• $\frac{1}{4}$