Answer: 20%.
- A 5%
- B 20%
- C 25%
- D 0.2%
Correct answer: B. 20%
Explanation: CV = (SD/mean)·100 = (5/25)·100 = 20%.
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