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-   -   Determining how many scores fell within a 70-80% range (https://www.askmehelpdesk.com/showthread.php?t=68014)

  • Mar 2, 2007, 10:23 AM
    mabrnc
    Determining how many scores fell within a 70-80% range
    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??
  • Mar 2, 2007, 01:21 PM
    galactus
    Remember the Empirical Rule. 1 standard deviation from the mean is 68% of the scores.
  • Jul 10, 2011, 04:10 PM
    debraknapp
    My answer is 36
  • Oct 15, 2012, 11:29 AM
    JamesTT
    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?

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