CUET and UG exam CUET UG 2025 Mock Test Series Engineering Mathematics Probability and Statistics Random Variables Basics
A random variable X has the following probability distribution
| X = xi | 1 | 2 | 3 | 4 |
| P(X = xi) | 0.1 | 0.2 | 0.3 | 0.4 |
The mean and the standard deviation are respectively
1
3 and 2
2
3 and 1
3
\(3\,\ and\,\sqrt 3 \)
4
2 and 1