Homework Help: statistics

Posted by Sara on Sunday, January 15, 2012 at 10:19pm.

Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?

statistics - PsyDAG, Monday, January 16, 2012 at 10:55am
Z = (mean1 - mean2)/standard error of the mean (SEm)

SEm = SD/√n

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.

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