A Group of Statistics Students Decided to Conduct a Survey

Multiple Choice

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 144 students. The statistics showed that students studied an average of 20 hours per week with a standard deviation of 10 hours. What is the probability that average student study time is between 18 and 22 hours?

A) 0.9640
B) 0.0160
C) 0.0360
D) 0.9836