SOLUTION: A university mathematics department gives a freshman calculus examination that allows those who pass to receive college credit for calculus. Scores for the exam are normally distr

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Question 1085029: A university mathematics department gives a freshman calculus examination that allows those who pass to receive college credit for calculus. Scores for the exam are normally distributed with a mean of 25 and standard deviation of 6. Twenty students have signed up to take the exam. What is the probability that their mean score will be 28 or higher?

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z >=(28-25)/6/sqrt(20)
z>=3*sqrt(20)/6, or >=2.24
probability of this is 0.0125