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Expected Value of Discrete Distribution

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Consider the probability distribution of $X$ given below:

$x$ $P(X=x)$
0 0.15
1 0.25
2 0.3
3 0.25
4 0.05

What is the expected value of $X$?

A

$0.2$

B

$0.8$

C

$1$

D

$1.8$

E

$2$