Conditional Probability UPDATED Exam
Questions and CORRECT Answers
Seventy-five percent of the flowers in the arrangement are roses and the rest are tulips. Of the
tulips, 50 percent are pink.
To the nearest whole percent, what is the probability that a randomly chosen flower from the
arrangement is a pink tulip? - CORRECT ANSWER- 13%
Nadia's bookshelf contains 10 fiction books, two reference books, and five nonfiction books.
What is the probability that she randomly picks up a reference book and then, without
replacing it, picks up a nonfiction book? - CORRECT ANSWER- 5/136
Twenty-two percent of the large pieces of mail that Rachel received this week were
magazines and the rest were catalogs. Of the catalogs, 36 percent were for clothing.
To the nearest whole percent, what is the probability that a randomly chosen large piece of
Rachel's mail was a clothing catalog? - CORRECT ANSWER- 28%
A bag contains one red pen, four black pens, and three blue pens. Two pens are randomly
chosen from the bag and are not replaced.
To the nearest hundredth, what is the probability that a black pen is chosen first and then
another black pen is chosen? - CORRECT ANSWER- 0.21
Lola pulls two marbles from a bag containing four red marbles, four blue marbles, and 12
yellow marbles without replacing them.
What is the probability that she pulled out a red marble first and a yellow marble second?
Express your answer in decimal form, rounded to the nearest hundredth. - CORRECT
ANSWER- 0.13
Questions and CORRECT Answers
Seventy-five percent of the flowers in the arrangement are roses and the rest are tulips. Of the
tulips, 50 percent are pink.
To the nearest whole percent, what is the probability that a randomly chosen flower from the
arrangement is a pink tulip? - CORRECT ANSWER- 13%
Nadia's bookshelf contains 10 fiction books, two reference books, and five nonfiction books.
What is the probability that she randomly picks up a reference book and then, without
replacing it, picks up a nonfiction book? - CORRECT ANSWER- 5/136
Twenty-two percent of the large pieces of mail that Rachel received this week were
magazines and the rest were catalogs. Of the catalogs, 36 percent were for clothing.
To the nearest whole percent, what is the probability that a randomly chosen large piece of
Rachel's mail was a clothing catalog? - CORRECT ANSWER- 28%
A bag contains one red pen, four black pens, and three blue pens. Two pens are randomly
chosen from the bag and are not replaced.
To the nearest hundredth, what is the probability that a black pen is chosen first and then
another black pen is chosen? - CORRECT ANSWER- 0.21
Lola pulls two marbles from a bag containing four red marbles, four blue marbles, and 12
yellow marbles without replacing them.
What is the probability that she pulled out a red marble first and a yellow marble second?
Express your answer in decimal form, rounded to the nearest hundredth. - CORRECT
ANSWER- 0.13
