E(X)=∑xi⋅P(xi)
=(−1)⋅21+0⋅51+1⋅103
=−21+103
=−105+103=−102=−51.
Let X be a discrete random variable and probability distribution X is | X | -1 | 0 | 1 | |---|---|---|---| | P(X) | 1 2 | 1 5 | 3 10 | Then E(X) is…
CUET UG 2022 — Mathematics Algebra
2022mcqeasy
Let X be a discrete random variable and probability distribution X is
| X | −1 | 0 | 1 |
|---|---|---|---|
| P(X) | 21 | 51 | 103 |
Then E(X) is equal to :
Official previous-year question
Held on 7 Aug 2022 · Verified 13 Jul 2026.
Options
- A
0
- B
−51
- C
51
- D
1
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