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Statistics Help

Question: Facebok says the average number of friends is 175.5 per person with a standard deviation of 90.57. in 25 random people what is the probability that the mean number of fb friends will be 190 or more>  Edit

Answer: z=(x-bar - ยต)/(σ/√n)
=(190-175.5)/ (90.57/√25)
=14.5/(90.57/5)
=0.800
P(x-bar> 190)
=P(z>0.800)
= 0.4237 (Ans.)
  Edit


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