- A2
- B1
- C3
- D4
Step-by-Step Solution
Frequencies: 11 -> 3, 12 -> 2, 13 -> 1, 14 -> 2. Most common = 3 (age 11), least common = 1 (age 13). Difference = 3 - 1 = 2.
Answer: A) 2
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