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OpenStudy (emilyjones284):
medal&fan! (: Scores on an exam are normally distributed with a mean of 76 and a standard deviation of 10. In a group of 230 tests, how many students score within one standard deviation of the mean?
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OpenStudy (dumbcow):
for a normal distribution, approx 68% are within 1 std dev
OpenStudy (emilyjones284):
These are the answers: about 156 students about 187 students about 78 students about 115 students
OpenStudy (dumbcow):
i meant 68% of the population....you are given that the population is 230
OpenStudy (emilyjones284):
would the answer be about 156 students?
OpenStudy (dumbcow):
yes
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OpenStudy (emilyjones284):
Oh okay thank you (:
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