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part a: The following data were obtained from a survey of college students. The variable X...

part a:

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x

0

1

2

3

4

5

P (X=x)

0.20

0.25

0.20

0.15

0.10

0.10


Find P( X > 1)

  • A. 0.80

  • B. 0.20

  • C. 0.55

  • D. 0.45

part b:

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x

0

1

2

3

4

5

P (X=x)

0.20

0.25

0.20

0.15

0.10

0.10


What is the expected value of X?

  • A. 6.25

  • B. 3.65

  • C. 1.20

  • D. 2.0

part c:

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x

0

1

2

3

4

5

P (X=x)

0.20

0.25

0.20

0.15

0.10

0.10


What is the variance of X?

  • A. 4.32

  • B. 2.34

  • C. 2.50

  • D. 3.42

math   Statistics-And-Probability   
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Answer #1

Paot ca 2 4 ↓- (0.45) 3Eo 2 Pastc Var r2Pcx -070 10 tỉ2xo.is +2x o 20 t3ROIS+42χ01ot skouo Now E(X2) = Hance

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