Answer: 4.
- A 2
- B 3
- C 4
- D 5
Correct answer: C. 4
Explanation: Mean of binomial = np = 10 × 0.4 = 4.
Venn diagram of the universal set U with events A and B, showing the intersection (A and B), the parts unique to each event, and the complement region outside both.
Concept context
Chance, events, conditional probability, and Bayes theorem