E(X)=30×51+10×103+(−10)×21=6+3−5=4.
The probability distribution of a discrete random variable X is given by :
| X | 30 | 10 | -10 |
|---|---|---|---|
| P(X) | 1/5 | 3/10 | 1/2 |
then E(X) is equals to
Held on 11 Aug 2022 · Verified 13 Jul 2026.
6
4
3
-6
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