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Let 'X' be a discrete random variable as...

Let 'X' be a discrete random variable assuming values `x_1, x_2, .........x_n` with probabilities `p_1, p_2,........., p_n` respectively. Then variance of 'X' is given by :

A

`E (X^(2))`

B

` E (X^(2)) + E(X)`

C

`E (X^(2))- [ E (X)]^(2)`

D

`sqrt(E(X^(2))-[E(X)]^(2))`

Text Solution

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The correct Answer is:
C
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ACCURATE PUBLICATION-PROBABILITY -Questions Carrying 1 mark Type -1 ( MULTIPLE CHOICE QUESTIONS )
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  2. Let X be a discrete random variable. The probaility distribution of X ...

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  3. Let 'X' be a discrete random variable assuming values x1, x2, ...........

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  4. If P (A) = (4)/(5) and P (A cap B ) = (7)/(10) , then P (B | A) is eq...

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  5. If P ( A cap B) = (7)/(10) and P (B) = (17)/(20) then P (A | B) equal...

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  6. If P (A) = (3)/(10), P (B) = (2)/(5) and P (B) = (2)/(5) and P (A cup...

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  7. If P (A) = (2)/(5) , P (B) = (3)/(10) and P ( A cap B) = (1)/(5) , ...

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  8. If A and B are two events such that P (A) = (1)/(2) , P (B) = (1)/(3)m...

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  9. If P (A) =0.4 , P (B) =0.8 and P (B |A) = 0.6 then P (A U B) is equal ...

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  10. If A and B are two events such that P(A) ne 0 and P(B/A) = 1, then

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  11. A and B are events such tahtP (A) = 0.4 , P (B) = 0.3 and P ( A cup B)...

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  12. You are given that A and B are two events such that P (B) = (3)/(5) , ...

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  13. You are given that A and B are two events such that P (B) = (3)/(5), ...

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  14. If P (B) = (3)/(5) P (A |B) = (1)/(2) and P (A cup B ) = (4)/(5) the...

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  15. If P(A) = 7/13, P(B) = 9/13 and P(A nn B) = 4/13· then P(A/B) is equal...

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  16. If A and B are such events that P (A) gt 0 and P (B) ne 1 , then P (A'...

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  17. If and B are two independent events with P (A) = (3)/(5) and P (B) = ...

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  18. If two events are independent then

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  19. Let A and B be two events such that P (A) = (3)/(8) , P (B) = (5)/(8) ...

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  20. Two events A and B are independent if P(A nn B) =

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