Probability with counting Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/probability/probability-with-counting/quiz/

1. 1

   A bag has 4 red and 6 blue marbles, 2 are picked at random, P(both red)
   1. A) P(all red) = 215
   2. B) P(all red) = 45
   3. C) P(all red) = 6

2. 2

   A team has 4 seniors and 6 juniors, 2 are picked at random, P(both seniors)

   Answer: ____________________

3. 3

   A club of 10 picks a president and a vice president at random, P(Ann is president and Ben is vice president)
   1. A) P(Ann president, Ben vice) = 1
   2. B) P(Ann president, Ben vice) = 190
   3. C) P(Ann president, Ben vice) = 90

4. 4

   2 cards are dealt from 52, P(both aces)

   Answer: ____________________

5. 5

   A bag has 5 red and 4 blue marbles, 3 are picked at random, P(all red)
   1. A) P(all red) = 10
   2. B) P(all red) = 84
   3. C) P(all red) = 542

6. 6

   A class has 7 boys and 5 girls, 2 are picked at random, P(1 boy and 1 girl)

   Answer: ____________________

7. 7

   2 cards are dealt from 52, P(both hearts)
   1. A) P(all hearts) = 117
   2. B) P(all hearts) = 78
   3. C) P(all hearts) = 1326

8. 8

   A club of 8 picks a president and a vice president at random, P(Ann is president)

   Answer: ____________________

9. 9

   A bag has 5 red and 3 blue marbles, 3 are picked at random, P(exactly 2 red)
   1. A) P(2 red, 1 blue) = 1528
   2. B) P(2 red, 1 blue) = 3
   3. C) P(2 red, 1 blue) = 10
   4. D) P(2 red, 1 blue) = 56

10. 10

    3 cards are dealt from 52, P(all kings)

    Answer: ____________________