Probability Quiz

What is the probability of spinning green?

• 0

• 1/2

• 1/4

• 3/4

A bag contains just 8 buttons, all of which are blue. What is the probability of picking a red button from the bag?

• 1/8

• 3/8

• 1/2

• 0

P(2 then 5) = 
*Hint: This is a compound event! To find the probability of a compound event, MULTIPLY the probability of each simple event.

• 1/6

• 1/12

• 1/36

• 2/12

Jim has 2 blue, 2 green, and 2 black socks. He picks out 2 socks, one after another. Determine the probability of him getting a matching pair of blue socks. Are these independent or dependent events?

• 1/15, independent

• 1/9, dependent

• 1/9, independent

• 1/15, dependent

What is the probability of picking a purple marble from the bag?

• 3/10

• 1/10

• 0

• 1

There are 23 marbles, each a different color in a bag. One of them is pink. What is the probability of reaching in to the bag, without looking, and selecting a pink marble?

• 1/22

• 1/23

• 23/1

A bag has 2 blue, 3 red, and 5 yellow tiles. Find the probability of picking a blue tile. Write your answer in simplest form.

• 2/10

• ⅕

• ⅖

• ½

A farm has 5 brown cows and 10 white cows. A fence is open and two cows escape. What is the probability that it will be a brown cow, then a white cow?

• 1/9

• 2/9

• 5/21

• 10/21

A jar contains black and white marbles. Two marbles are chosen without replacement. The probability of selecting a black marble and then a white marble is 0.34, and the probability of selecting a black marble on the first draw is 0.47. What is the probability of selecting a white marble on the second draw, given that the first marble drawn was black?

• 16%

• 1.38%

• 72.3%

• Not enough information

45% total of the children in a school have a dog, 30% total have a cat, and 18% have a dog and cat. What percent of those who have a cat also have a dog?

• 60%

• 40%

• 24%

• 1.7%