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A random avriable X has its range {1,2,3...

A random avriable X has its range `{1,2,3}`. `P(X=1)=1//6, P(X=2)=1//3, P(X=3)=1//2`. If mean =a, variance =b and standard =c then the descending order of a,b,c, is

A

a,b,c

B

b,c,a

C

c,a,b

D

a,c,b

Text Solution

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The correct Answer is:
D
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  • A random variable X has its range {1,2,3}. If P(X=1)=1//6, P(X=2)=1//3.P(X=3)=1//2 then mean =

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    `7//3`
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    `5//3`
    C
    `4//3`
    D
    `1//3`

  • A random varible X has its range :1,2,3}. If P(X=1)=c, P(X=2)=3c,P(X=3)=5c, then c=

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