Random variables Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/university-statistics/random-variables/quiz/

1. 1

   x: 0, 1, 2, 3; P(x): 0.1, 0.3, 0.4, 0.2, find the mean
   1. A) 1.5
   2. B) 17
   3. C) 1
   4. D) 1.7

2. 2

   x: 1, 2, 3, 4; P(x): 0.4, 0.3, 0.2, 0.1, find the mean

   Answer: ____________________

3. 3

   x: 0, 2, 4; P(x): 0.3, 0.4, 0.3, find the expected value
   1. A) 0.2
   2. B) 1
   3. C) 20
   4. D) 2

4. 4

   x: 1, 2, 3; P(x): 0.5, ?, 0.2, find the missing probability

   Answer: ____________________

5. 5

   X: 1, 2, 3, 4, 5; P(x): 0.1, 0.2, 0.3, 0.3, 0.1, find the expected value
   1. A) 1
   2. B) 31
   3. C) 3
   4. D) 3.1

6. 6

   x: 0, 1, 2, 3; P(x): 0.25, 0.25, 0.25, ?, find the missing probability

   Answer: ____________________

7. 7

   x: 0, 1, 2, 3; P(x): 0.1, 0.3, 0.4, 0.2, find the standard deviation
   1. A) 0.9
   2. B) 0.09
   3. C) 1.7
   4. D) 0.81

8. 8

   X: 0, 1, 2, 3, 4; P(x): 0.1, 0.2, 0.4, 0.2, 0.1, find the standard deviation

   Answer: ____________________

9. 9

   x: 0, 1, 2, 3; P(x): 0.4, 0.3, 0.2, 0.1, find the standard deviation
   1. A) 1
   2. B) 0.1
   3. C) 10

10. 10

    x: 0, 1, 2, 3, 4; P(x): 0.05, 0.15, 0.4, 0.3, 0.1, find the mean

    Answer: ____________________