Question

A normally distributed dataset has a mean of 13.5 and a standard deviation of 0.5.
In which interval can you find the middle 68% of the data?


13
14.5

13
14

12
15

12.5
14.5

Answer 1

The middle 68% lies within one standard deviation of the mean: 13.5 ± 0.5 → [13.0, 14.0]. So the correct choice is 13 to 14.