Note 2: We can use the probability distribution to calculate probabilities for associated events.
examples: Let X = number of heads observed when flipping a fair coin.
P(X ≥ 2) = P(X = 2) + P(X = 3) + P(X = 4)
= 6/16 + 4/16 + 1/16 = 11/16
2. What’s the probability of getting less than 4 heads?