+ . = Hence p x i ) is a probability mass function. For X = , the probability . , comes from / , the other probabilities are estimated similarly.
Note Example . A random variable X has the following probability function Values of X p ( x ) a a a a a a + a (i) Find a , Evaluate (ii) P X < , (iii) P X > and (iv) P < ≤ (i) Since the condition of probability mass function is p x i i ∞ = ஃ p x i i