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    Celia Taylor's Avatar
    Celia Taylor Posts: 1, Reputation: 1
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    #1

    Sep 22, 2008, 05:34 PM
    Finding Average
    How do you find the missing number when the average is given?
    dcasmr's Avatar
    dcasmr Posts: 3, Reputation: 1
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    #2

    Sep 22, 2008, 08:43 PM
    Suppose you have 5 numbers: 10, 15, 20, 25, 30
    The average is 20.
    Now, if we know the average, the number of observations which are 5 on this example,
    Then, the missing number is 5*20 - (10+20+25+30) = 100-85 = 15

    More generally, the missing number is the mean times the number of observations minus the numbers that you know.
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