#### Question

Find the expected value, variance and standard deviation of random variable X whose probability mass function (p.m.f.) is given below:

X=x | 1 | 2 | 3 |

P(X=x) |
1/5 | 2/5 | 2/5 |

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Solution for question: Find the expected value, variance and standard deviation of random variable X whose probability mass function (p.m.f.) is given below concept: Probability Distribution - Expected Value, Variance and Standard Deviation of a Discrete Random Variable. For the courses HSC Arts, HSC Science (Computer Science), HSC Science (Electronics), HSC Science (General)