Find the Expected Value of a Random Variable X Having

Find the expected value of a random variable X having the following probability distribution: $$\begin{array} { c c c c c } x & 10 & 20 & 30 & 40 \\P ( X = x ) & \frac { 20 } { 50 } & \frac { 10 } { 50 } & \frac { 15 } { 50 } & \frac { 5 } { 50 }\end{array}$$ Round your answer to tenth if necessary.

A) $E ( X ) = 21$
B) $E ( X ) = 16$
C) $E ( X ) = 25$
D) $E ( X ) = 12.5$
E) $E ( X ) = 10$

Correct Answer:

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