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In each case determine wheather the giv...

In each case determine wheather the given values can be looked upon as the values of a probability distribution of a random variable which can take up only the values 1,2,3 and 4 and explain your answer :
`f(1)=0.26,f(2)=0.26,f(3)=0.26, f(4)=0.22`.

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