Answer: the square root.
- A the square root
- B the square
- C the reciprocal
- D double the value
Correct answer: A. the square root
Explanation: Standard deviation = √(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