The Mean Length of Time, Per Week, That Students at a Certain

Multiple Choice

The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard deviation of 1.2 hours. Assuming the distribution of study times is normal, what percent of students spend more than 25.1 hours per week on homework?

A) 16.5%
B) 5%
C) 12.5%
D) 25%