Answer: 750.
- A 750
- B 700
- C 800
- D 7500
Correct answer: A. 750
Explanation: Total = mean × count = 75 × 10 = 750.
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