Simple and Compound Probability Review

A box contains all the letters of the word U N D E R S T A N D. What is the probability of selecting an 'N' first and a 'D' next, if the first letter is replaced?

• 3/50

• 1/25

• 1/10

• 2/5

If you randomly select a student in this room, what is the probability of selecting a student with a name starting with "A"?

• 2/7

• 2/5

• 1/2

• 3/4

A single die is rolled in a game. What is the probability that it will land on 4?

• 1/12

• 1/6

• 4/6

• 1/4

Yahir has a bag of marbles containing 3 red, 2 green, 4 yellow, and 1 blue marble. What is the probability that he will randomly choose a green marble?

• 1/5

• 2/8

• 3/7

• 1/2

Yahir has a bag of marbles containing 3 red, 2 green, 4 yellow, and 1 blue marble. What is the probability that he will randomly choose two green marbles with replacement?

• 3/100

• 2/10

• 1/25

• 1/2

What is the probability of selecting the letter “p” and then the letter “t” in the word “probability” if you do NOT replace the first letter?

• 1/11

• 1/55

• 1/121

• 1/110

A shelf contains 10 books: 6 fiction and 4 nonfiction. DK walks up and chooses a book. Then, Fatima chooses a book. What is the probability that they both choose a fiction book?

• 1/90

• 1/3

• 9/25

• 3/10

In a game, Allan is spinning this spinner. What is the probability of spinning green twice?

• 1/3

• 3/8

• 9/64

• 1/64

What is the probability of spinning the spinner and landing on blue?

• 3/8

• 1/8

• 3/4

• 1/4

Look at the set of blocks. What is the probability of choosing a red block? (simplify your answer)

P(red) =

• 1/5

• 2/7

• 1/6

• 1/12