Determining how many scores fell within a 70-80% range [Archive]

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mabrnc

Mar 2, 2007, 10:23 AM

Hi,
I am wondering if 100 students took an exam and the mean score was 75, with a standard deviation of 5 ( and the scores were normally distributed) how may scores fell between 70-80??

galactus

Mar 2, 2007, 01:21 PM

Remember the Empirical Rule. 1 standard deviation from the mean is 68% of the scores.

debraknapp

Jul 10, 2011, 04:10 PM

My answer is 36

JamesTT

Oct 15, 2012, 11:29 AM

I am wondering if 100 students took an exam and the mean score was 70, with a standard deviation of 5 ( and the scores were normally distributed) how may scores fell between 0-69, 70-79, 80-89, 90-100?