Define mathematical expectation for discrete random variable.
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Let x is a value within the range of discrete random variable X .
Assuming that values x₁ , x₂ , x₃ , ..... xₙ with respectively probabilities of occurrence P₁ , P₂ , P₃, ....... Pn.
Where P₁ + P₂ + P₃ + ...... + Pn = 1
So, mathematical expectation is given by E(x) = x₁P₁ + x₂P₂ + x₃P₃ +
..... + xnPn .
We can also write it E(X) = ∑xP or , ∑xf(x)
Assuming that values x₁ , x₂ , x₃ , ..... xₙ with respectively probabilities of occurrence P₁ , P₂ , P₃, ....... Pn.
Where P₁ + P₂ + P₃ + ...... + Pn = 1
So, mathematical expectation is given by E(x) = x₁P₁ + x₂P₂ + x₃P₃ +
..... + xnPn .
We can also write it E(X) = ∑xP or , ∑xf(x)
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