Please solve each question correctly step-by-step and explain.
[30 points] A study shows that 20% of coffee drinkers at a restaurant prefer coffee with cream, sugar, or both? (Give your answer to four decimal places.)
a) What is the probability that a coffee drinker prefers coffee with cream, sugar, or both? P(coffee with cream or sugar) = 0.2
b) What is the probability that at least two coffee drinkers prefer coffee with cream, sugar, or both? (Give your answer to four decimal places.) P(X ≥ 2) = 1 - P(X = 1) = 1 - P(X = 0) - P(X = 1)
c) How many coffee drinkers do you expect to prefer coffee with cream, sugar, or both? E = B * np = 25 * (0.2) = 5