The mean score for a standardized test is 1700 points. The results are normally distributed with a standard deviation of 75 points. If 10,000 students take the exam, how many would you expect to score above 1850 points?

Question

anonymous · Answer

The rule is shown in the figure
1850 is 2 sd above the mean

anonymous · Answer

What percentage would be above the mean + 2 sd?

anonymous · Answer

@coolaidd Do you know how to calculate Z score?
-> Look up for P
Since you want P ( X > 1850 points) : .5 - P
Then: 10,000 * ( .5 - P ) = 228 students with score > 1,850 points.

anonymous · Answer

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