Posted by ron on Wednesday, November 2, 2011 at 8:36am.
The average teenager spends 7.5 hours per week playing computer and video games. In a random sample of 110 teenagers, what is the probability that their mean time for playing games is more than 8 hours per week?

statistics  PsyDAG, Wednesday, November 2, 2011 at 11:17pm
You need some measure of variability to answer the question.