A Group of Statistics Students Decided to Conduct a Survey

A group of statistics students decided to conduct a survey at their university to find the average
(mean) amount of time students spent studying per week. Assuming a standard deviation of 3
Hours, what is the required sample size if the error is to be less than ½ hour with a 99% level of
Confidence?

A) 196
B) 240
C) 15
D) 16