Finding the Probability of (A U B)

1. A card is drawn at random from a standard deck of cards. What is the probability of drawing an ace or a jack?

• 1/13

• 2/13

• 3/13

• 4/14

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CCSS.HSS.CP.B.7

2. A die is rolled. What is the probability of getting a prime number or an even number?

• 0

• 5/6

• 6/6

• 1

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CCSS.HSS.CP.B.7

3. A spinner is divided into 6 equal parts numbered 1 – 6. If it is spun twice, find the probability that the sum of the first spin and the second spin is less than 5.

• 1/6

• 3/6

• 5/6

• 6/6

4. A pouch contains 10 candies of the same shape and size. Five of the candies are mints, 4 are toffees and 1 chocolate. If one candy is picked at random, what is the probability that it is a mint or toffee?

• 0.4

• 0.5

• 0.9

• 1

5. A scrabble has 100 tiles. Nine of them are A’s, 12 are E’s, 9 are I’s, 8 are O’s and 4 are U’s. What is the probability that a randomly selected scrabble tile is E or O?

• 2%

• 8%

• 12%

• 20%

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CCSS.HSS.CP.B.7

6. The probabilities of three race car drivers P, R, and S of winning the race is 1/5, ¼ and ¼, respectively. Assuming that only one driver can win the race, find the probability that neither R nor S wins.

• 3/12

• 4/12

• 5/12

• 7/12

7. A cube with the letters W, E, R, T, Y, U was rolled. What is the probability of getting a vowel or a letter in the word POWER?

• 1/3

• 1/2

• 2/3

• 5/6

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CCSS.HSS.CP.B.7

8. Pieces of colored papers numbered

1, 2, 3, . . ., 18, 19, 20 are placed in box and mixed thoroughly. One colored paper is picked at random. What is the probability of getting an even number or a multiple of 3?

• 3/20

• 6/20

• 10/20

• 13/20

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CCSS.HSS.CP.B.7

9. A factory has 40 workers, 28 men and 12 women. Three-fourths of the men and half of the women are married. What is the probability that one factory worker chosen at random is woman or married?

• 6/40

• 27/40

• 33/40

• 1

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CCSS.HSS.CP.B.7

10. Suppose that the probabilities that Iya and Bella will be allowed to go a dance party 0.7 and 0.5, respectively. The probability that both of them will be allowed to attend is 0.3. What is the probability that at least one of them will go the party?

• 0.3

• 0.7

• 0.9

• 1.2

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CCSS.HSS.CP.B.7