Posted by Amy on Saturday, June 9, 2012 at 10:09pm.
Facebook reports that the average number of facebook friends worldwide is 175.5 with the stand deviation of 90.57. Take sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more..HELP

Math  PsyDAG, Sunday, June 10, 2012 at 12:58pm
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. Multiply by 25.

Math (Oops)  PsyDAG, Sunday, June 10, 2012 at 5:50pm
You do not need to multiply by 25.
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