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12 cards from this deck
Long-term average of random variable
Central tendency
E(X)=∑(x×P(x))E(X) = \sum (x \times P(x))E(X)=∑(x×P(x))
Value of the random variable
Probability of xxx
E(X)=∫x×f(x) dxE(X) = \int x \times f(x) \, dxE(X)=∫x×f(x)dx
Probability density function of xxx
Doesn't necessarily equal any single outcome; represents average over repeated trials
Zero
Economics, insurance, gambling
3.53.53.5
0.70.70.7
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