Answer: Median and quartiles.
- A Mean
- B Mode
- C Median and quartiles
- D Standard deviation
Correct answer: C. Median and quartiles
Explanation: An ogive (cumulative frequency curve) is used to graphically determine median, quartiles, and percentiles.
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