Probability

1. Consider a box that contains 14 blue balls and 12 green balls. A ball is drawn at random and the brand is noted and then put back inside the box. then, another ball is drawn at random. find the probability that both balls are blue?

• A. 39/159

• B. 49/149

• C. 49/169

• D. 29/139

2. A jar of marbles contains 4 blue marbles, 5 red marbles, 1 green marble, and 2 black marbles. A marble is chosen at random from the jar. After replacing it, a second marble is chosen. find the probability of picking a blue and then a red marble?

• A. 5/36

• B. 7/37

• C. 8/38

• D. 9/39

3. A coin and a die are tossed simultaneously. what is the probability that the coin will land on head and the die on less than 3?

• A. 1/2

• B.1/4

• C. 1/6

• D. 1/8

4. A card is chosen at random, without replacing it, a second card is chosen. whast is the probability that the first card chosen is a queen and the second card is an jack?

• A. 4/336

• B. 4/363

• C. 4/636

• D. 4/663

5. Consider a box that contains 14 blue balls and 12 green balls, suppose that two balls are drawn one after the other without putting back the first ball. find the probability that both balls are green?

• A. 36/650

• B. 66/650

• C. 76/650

• D. 66/750

6. A class is composed of 10 boys and 15 girls. If two presenter to a poem recital are to be chosen in succession, what is the probability that the first is a boy and the second is a girl?

• A. 1/2

• B. 1/3

• B. 1/4

• D. 1/8

7. A box contains 9 pieces of numbered balls. if three pieces are taken from the box one at a time without replacement, find the probability that they alternately taken:

A. Odd, Even, Odd

• A. 4/63

• B. 6/63

• C. 8/63

• D. 10/63

8. Camille has 55 red chips, 12 yellow chips and 20 white chips. what is the probability that Camille randomly selects a red chips or a white chip?

• A. 75/88

• B. 77/88

• C. 79/88

• D. 81/88

9. A box contains 8 white balls, 10 red balls and 6 blue balls. What is the probability of drawing a white ball and red ball?

• A. 0.5

• B. 0.25

• C. 0.75

• D. 1.25

10. Precious likes to wear colored shirts, she has 20 shirts in the closet in the closet. 8 of these are blue, 6 are red and the rest are in differ colors. what is the probability that she will wear a blue or a red shirt.

• A. 5/8

• B. 7/10

• C. 9/13

• D. 11/15