Day 24 - 25 BW:Review on Multiplication Rule and Conditional

A key ring has 12 keys, 3 of which open the house door. If two keys are randomly selected without replacement, what is the probability that neither key opens the door?

• $\frac{1}{22}$

• $\frac{6}{11}$

• $\frac{9}{16}$

• $\frac{21}{22}$

Tags

CCSS.HSS.CP.B.9

There are 9 movies showing at a theater. Two are action movies, two are children’s movies, and the other movies are comedies. Ashley randomly selects 2 different movies to see. What is the probability that the first movie is an action movie and the second movie is a comedy?

• $\frac{1}{18}$

• $\frac{10}{81}$

• $\frac{5}{36}$

• $\frac{7}{9}$

Tags

CCSS.HSS.CP.B.8

CCSS.HSS.CP.B.9

CCSS.HSS.CP.A.1

A store has 20 boxes of cereal A and 10 boxes of cereal B. One box of each kind of cereal has a prize. If one box of each kind is randomly selected, what is the probability that neither box has a prize?

• $\frac{1}{200}$

• $\frac{29}{200}$

• $\frac{171}{200}$

• $\frac{199}{200}$

Tags

CCSS.HSS.CP.B.8

CCSS.HSS.CP.A.1

Anna has a bag of marbles for her little sister. It contains 12 red marbles, 6 white marbles, and 2 blue marbles. She drops the bag and three marbles roll out. What is the probability that all 3 marbles are white?

• $\frac{1}{120}$

• $\frac{1}{57}$

• $\frac{15}{343}$

• $\frac{3}{20}$

Tags

CCSS.HSS.CP.B.8

CCSS.HSS.CP.B.9

CCSS.HSS.CP.B.7

You pick a marble from this bag.

What is the probability you will choose either a black then a white marble without replacement?

• 1/10

• 9/100

• 1/20

• 2/5

Tags

CCSS.HSS.CP.B.8

CCSS.HSS.CP.A.1

CCSS.HSS.CP.A.3

CCSS.HSS.CP.B.6

What is the probability that they speak French given they are a girl? 

• 2.14
• .24
• .4
• .8571

Tags

CCSS.HSS.CP.A.3

CCSS.HSS.CP.B.6

CCSS.HSS.CP.A.4

What is the probability that a student does not play on a sports team given that they play an instrument?

• .27

• .45

• .55

• .15

Tags

CCSS.HSS.CP.A.3

CCSS.HSS.CP.B.6

CCSS.HSS.CP.A.4

Your drawer contains 6 red socks and 10 blue socks. It's too dark to see which are which, but you grab two anyway. What is the probability that both socks are red?

• 5/15
• 36/256
• 1/3
• 1/8

Tags

CCSS.HSS.CP.B.8

CCSS.HSS.CP.B.9