Question: Let X be a random variable such that X = ( 1, with probability 1 5 , 2, with probability 4 5 . Which of

Let X be a random variable such that X =

(

1, with probability 1 5

, 2, with probability 4 5

.

Which of the following is the correct expression for E

√

X



?

a. q 1

5

× 1 +

4 5

× 2.

b. 1 5

√

1 +

4 5

√

2.

c. q 1

5

× 1 +

q 4

5

× 2.

d. 1 q

1 5

+ 2 q

4 5

.

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