Probability

Suppose you choose a marble from a bag containing 4 red marbles, 3 white marbles, and 5 blue marbles. You return the first marble to the bag and then choose again. Find P(red and blue).

• 7/12

• 3/4

• 5/3

• 5/36

Suppose Ruth Ann has 3 routes she can choose from to get from school to the library, and 5 routes from the library to her home. How many routes are there from Ruth Ann’s school to her home with a stop at the library?

• 60

• 25

• 9

• 15

A yogurt shop offers 4 different flavors of frozen yogurt and 8 different toppings. How many choices are possible for a single serving of frozen yogurt with one topping?

• 1680

• 64

• 16

• 32

In a word game, you choose a tile from a bag, replace it, and then choose another. If there are 27 vowels and 15 consonants, what is the probability you will choose a consonant and then a vowel?

• 135/28

• 45/196

• 1/42

• 135/14

You have the numbers 1–24 written on slips of paper. If you choose one slip at random, what is the probability that you will NOT select a number divisible by 3?

• 3/8

• 1/3

• 5/8

• 2/3

Thomas, Jenna, and Maria are playing a game. They have a bag that contains 31 white tiles and 2 red tiles. Each player takes turns picking a tile at random and does not return the tiles to the bag. The player who draws a red tile first is the winner. In the first round, Thomas goes first, then Jenna, and then Maria, and none of them draws a red tile. What is the probability that Thomas will win the game on his second turn?

• 1/15

• 2/33

• 2/29

• 1/16

Tags

CCSS.7.SP.C.6

The delivery van arrives at an office every day between 3 PM and 5 PM. The office doors were locked between 3:20 PM and 3:30 PM. What is the probability that the doors were unlocked when the delivery van arrived?

• 5/12

• 11/12

• 1/12

• 11/24

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

You have the numbers 1–25 written on slips of paper. If you choose one slip at random, what is the probability that you will select a number that divisible by 4?

• 1/5

• 6/25

• 4/25

• 2/3

Tags

CCSS.7.SP.C.7B

Lynn and Dawn tossed a coin 30 times and got heads 20 times. What is the experimental probability of tossing heads using Lynn and Dawn’s results?

• 2/3

• 3/2

• 1/3

• 1/2

Tags

CCSS.7.SP.C.6

Two bags contain white balls and yellow balls. The first bag contains 6 white balls and 6 yellow balls and the second bag contains 2 white balls and 3 yellow balls. A ball is drawn at random from each bag. What is the probability that both balls are white?

• 1/12

• 8/17

• 1/5

• 2/15