Answer: 9.
- A 7
- B 8
- C 9
- D 4
Correct answer: C. 9
Explanation: 9 appears 3 times (most frequently), so mode = 9.
In a perfectly normal (bell-shaped) distribution, mean, median, and mode all coincide at the centre; about 68% of data falls within 1 standard deviation of the mean, 95% within 2, and 99.7% within 3 - the empirical rule used to judge how typical or extreme a value is.
Concept context
Mean, median, mode, standard deviation, and data interpretation