And Probability

80 students study Music at Harmony College. The number of them doing Chorus, Band or Orchestra are shown on the Venn diagram. What is the probability that a randomly selected Music student studies exactly two of these options?

• 19/80

• 24/80

• 0.19

• 34/80

A bag contains 5 red marbles, 4 blue marbles and a green marble. Two marbles are drawn from the bag (without replacement). What is the probability that both marbles are red?

• ⅕ × ¼ = 1/20

• 4/5 × 4/5 = 16/25

• 4/5 × 3/4 = 12/20

• none of these options is correct

If a letter is drawn randomly from the bag shown, what is the probability that it is not a consonant?

• 1/14

• 7/15

• 5/14

• 1/2

80 students study Music at Harmony College. The number of them doing Chorus, Band or Orchestra are shown on the Venn diagram. What is the probability that a randomly selected Music student does Band only?

• 50%

• 20%

• 20/70

• 1/4

80 students study Music at Harmony College. The number of them doing Chorus, Band or Orchestra are shown on the Venn diagram. What is the probability that a randomly selected Music student studies Chorus and Orchestra?

• 12%

• 3/20

• 0.12

• 12

80 students study Music at Harmony College. The number of them doing Chorus, Band or Orchestra are shown on the Venn diagram. What is the probability that a randomly selected Music student studies only one of these options?

• 19/80

• 24/80

• 0.19

• 46/80

A bag contains 5 red marbles, 4 blue marbles and a green marble. If a marble is drawn at random from the bag, what is the probability that it is blue?

• 4

• 4/9

• 0.4

• 0.04

A bag contains 5 red marbles, 4 blue marbles and a green marble. Two marbles are drawn from the bag (without replacement). What is the probability that both the second marble is green, given that the first marble was red?

• 1/9

• 1/20

• 2/20

• none of these options is correct

A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6

• 1/2

• 1/3

• 1/6

Which shows the sample space for flipping two coins?

• H, T

• HH, HT, TH, TT

• HH, TT

• Dime, Nickel