Question 1190698: Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.61 and a standard deviation of 0.43. Using the empirical rule, what percentage of the students have grade point averages that are at least 3.47 ?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
z=0.86/0.43=2
3.47 is 2 sd above the mean
more than 2 sd deviation from the mean, either direction, is 5%, so that in one direction it is 2.5%, the answer.
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