pls solve bcd Find the expected value of each random variable: a.  x 10 20 30 P(X=x) 0.3 0.5 0.2   b.  x 2 3 4 5 P(X=x) 0.3 0.4 0.2 0.1   c) Find the standard deviation of the random variables in part(a). d) Find the standard deviation of the random variables in part(b

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pls solve bcd

Find the expected value of each random variable:

a. 

x 10 20 30
P(X=x) 0.3 0.5 0.2

 

b. 

x 2 3 4 5
P(X=x) 0.3 0.4 0.2 0.1

 

c) Find the standard deviation of the random variables in part(a).
d) Find the standard deviation of the random variables in part(b

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