Question 1046432
The mean is 74.2 and the sd is 13.9
Approximately 68% of observations are within 1 sd of the mean
Therefore, (60.3, 88.1) are the limits for observations within 1 sd of the mean.

Approximately 95% of the observations are within 2 sd s of the mean
Therefore, (46.4, 102.0) are within 2 sd s of the mean.

All the observations are in an infinite interval. but for the purposes of this question, nearly all (99.7%) are within 3 sd s of the mean
Therefore, (32.5, 115.9) are within 3 sd s of the mean.