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Math Help - Calculating mean

  1. #1
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    Calculating mean

    12 boys and 8 girls take a test
    The mean mark of these 20 students is 7.

    Calculate the total of the marks of the 20 students.


    Please help me with this! Am I right in saying the formula for calculating mean is:

    Frequency * marks / total frequency = mean

    How do go from here?
    Last edited by mr fantastic; April 16th 2011 at 05:26 AM.
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  2. #2
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    Quote Originally Posted by yorkey View Post
    12 boys and 8 girls take a test
    The mean mark of these 20 students is 7.

    Calculate the total of the marks of the 20 students.


    Please help me with this! Am I right in saying the formula for calculating mean is:

    Frequency * marks / total frequency = mean

    How do go from here?
    (Total marks)/20 = 7 ....
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