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A random variable X has the following di...

A random variable X has the following distribution
`{:(X=x_(1):,-2,-1,0,1,2,3),(P(X=x_(1)):,0.1,k,0.2,2k,0.3,k):}`
The value of k and its mean and variance are

A

0.1,1.0,0.85

B

0.5, 0.2, 2.1

C

0.21, 0.85, 2.16

D

0.1, 0.8, 2.16

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-THEORETICAL DISTRIBUTIONS-EXERCISE 1 (CHOOSE THE CORRECT ANSWER FROM THE ALTERNATIVE 1,2,3 OR 4 GIVEN )
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  12. A coin is tossed 3 times. The probability of getting head once and tai...

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  14. If X is the number of heads getting when 8 coins are tossed , then mea...

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  16. If X is the sum of the number when two dice are rolled , then mean var...

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  17. In a binomial distribution n=12, p=1//3. Then mean and variance are

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  20. In a binomial distribution n=20, q=0.75. Then mean =

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