Answer: Square.
- A Square root
- B Square
- C Double
- D Half
Correct answer: B. Square
Explanation: Variance = (standard deviation)². Conversely, SD = square root of variance.
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