Maths-
General
Easy
Question
A random variable X has the following distribution

The value of
and P(X<3) are equal to
Hint:
Sum of all probabilities is 1
The correct answer is: 
Given :

Sum of all probabilities is 1
P(x=1) + P(x = 2) + P(x = 3) + P(x =4) = 1
k + 2k + 3k + 4k = 1
k = 
Now, P(x < 3) = P(x=1) + P(x =3)
P(x < 3) = k + 2k = 3k = 
Thus, the value of
is
and P(X<3) is 
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