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A random variable X is specified by th...

A random variable X is specified by the following distribution law :
`{:(x,2,3,4),(P(X=x),0.3,0.4,0.3):}`
Then the variance of this distribution is :

A

0.6

B

0.7

C

0.77

D

0.55

Text Solution

Verified by Experts

The correct Answer is:
A
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