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Find the expected value of X from the probability table.

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Find the expected value of X from the probability table.
 

X   1 2  3 
P(X)   0.3  0.8 0.4  
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The expected value of X, E(X) = ∑X*P(X).

E(X) = 1 * 0.3 + 2 * 0.8 + 3 × 0.4
       
           = 0.3 + 1.6 + 1.2 = 3.1

Answer: 3.1

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