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(solution) The following table lists the probability distribution of a


 

The following table lists the probability distribution of a discrete random variable x:

x 2 3 4 5 6 7 8
P(x) 0.15 0.31 0.21 0.13 0.12 0.06

0.02


The mean of the random variable x is: 

The standard deviation of the random variable x, rounded to three decimal places, is: 

x p

 

2

 

3

 

4

 

5

 

6

 

7

 

8 mean=

 

variance

 

Standard deviation x*p

 

0.15

 

0.31

 

0.21

 

0.13

 

0.12

 

0.06

 

0.02 4.02

 

2.3796

 

1.542595 x^2

 

0.3

 

0.93

 

0.84

 

0.65

 

0.72

 

0.42

 

0.16

 

4.02 x^2*p

 

4

 

9

 

16

 

25

 

36

 

49

 

64 0.6

 

2.79

 

3.36...

 


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Sep 13, 2020

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