Homework Help: statistics

Posted by michelle on Monday, September 26, 2011 at 10:30am.

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15.

statistics - PsyDAG, Monday, September 26, 2011 at 11:05am
What is your question?
statistics - Kimberly Rubino, Tuesday, September 27, 2011 at 11:26am
Yes, it would be unusal for the mean of a sample of 3 to be 115 or more because there is only a 4.18% chance for this to happen.

P(X >= 115)
= P(X >= (115 - 100) / sqrt(15^2 / 3))
= P(X >= 1.732050808)
= 0.0418

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