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Stats help!!!!!!


fairylight

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OK im prob being really stupid, but i cant for the life of me work out how to do this problem. can someone help???

 

A random variable X takes the integer value x with probability P(X=x) defined by

 

P(X=x) = kx^2, x = 1, 2, 3

P(X=x) = k(7-x)^2 x = 4,5,6

P(X=x) = 0 otherwise

 

Find the value of k :confused:

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