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A class has 15 students whose ages ar...

A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years. One student is selected in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded. What is the probability distribution of the random variable X? Find mean, variance and standard deviation of X.

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RD SHARMA ENGLISH-MEAN AND VARIANCE OF A RANDOM VARIABLE -All Questions
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  10. Two cards are drawn from a pack of well shuffled 52 cards one by one w...

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  11. Let X represent the difference between the number of heads and the ...

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  13. The probability distribution of a random variable X is given below: X ...

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  15. In a single throw of a dice; if X denotes the number on its upper face...

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  18. Evaluate the following definite integral: int(pi//3)^(pi//4)(t a n x+c...

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  19. The random variable X can take only the values 0, 1,2. Given that P(X=...

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  20. Two dice are thrown simultaneously. If X denotes the number of sixe...

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