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For the following probability distributi...

For the following probability distribution

`E(X^(2))` is equal to .......

A

3

B

5

C

7

D

10

Text Solution

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The correct Answer is:
D
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KUMAR PRAKASHAN-PROBABILITY-Solutions of NCERT Exemplar Problems (Objective type Questions)
  1. A bag contains 5 red and 3 blue balls. If 3 balls are drawn at random ...

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  2. A bag contains 5 red balls and 3 black marbles. Three balls are drawn ...

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  3. Three persons A, B and C, fire at a target in turn starting with A. Th...

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  4. Assume that in a family, each child is equally likely to be a boy or a...

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  5. A die is thrown and a card is selected at random from a deck of 52 pla...

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  6. A box contains 3 orange balls, 3 green balls and 2 blue balls. Three b...

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  7. A flashlight has 8 batteries out of which 3 are dead. If two batteries...

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  8. Eight coins are tossed together. The probability of getting exactly 3 ...

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  9. Two dice are thrown. If it is known that the sum of numbers on the dic...

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  10. Which one is not a requirement of a binomial distribution ?

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  11. Two cards are drawn from a well shuffled deck of 52 playing cards with...

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  12. The probability of guessing correctly atleast 8 out of 10 answers on a...

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  13. The probability that a person is not a swimmer is 0.3. The probability...

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  14. The probability distribution of a discrete random variable X is given ...

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  15. For the following probability distribution : E(X) is equal to .....

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  16. For the following probability distribution E(X^(2)) is equal to ....

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  17. Suppose a random variable X follows the binomial distribution with par...

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  18. In a college, 30% students fail in physics, 25% fail in mathematics an...

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  19. A and B are two students. Their chances of solving a problem correctly...

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  20. A box has 100 pens of which 10 are defective. What is the probability ...

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