Calculation of variance
Calculation of variance
IB Year 5 | Grade 11
The p.d.f. of a random variable \(X\) is given by
| \(x\) | \(-2\) | \(-1\) | \(0\) | \(1\) | \(2\) |
|---|---|---|---|---|---|
| \(\mathrm{P}(X=x)\) | \(0.2\) | \(0.1\) | \(0.4\) | \(0.1\) | \(0.2\) |
Find \(\mathrm{Var}(X)\).
Solution:
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Answer:\(\operatorname{Var}(X)=\frac95\).
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