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Math Help - Simple Averages

  1. #1
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    Simple Averages

    Need help sir/maam.

    I do have a data with age. N= 10
    Age----Count
    5------3
    10-----2
    15-----5

    How to compute the averages of a count? (formula)
    Average shld be = 11
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  2. #2
    Super Member TheChaz's Avatar
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    5 + 5 + 5 (<--- 3 times) + 10 + 10 (<-- 2 times) + 15 + 15 + 15 + 15 + 15 (<-- 5 times) = 110
    110/10 = 11
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  3. #3
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    Is there any other way? I do have a large set of data (age) And I need a simple formula..
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  4. #4
    Super Member TheChaz's Avatar
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    There might be... it's been a while since I've had to learn such things.
    Rather than having ___ + ___ + ___ + ___ + ...
    you could multiply (using your numbers) 5*3 + 10*2 + 15*5
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  5. #5
    Senior Member Sambit's Avatar
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    A simpler way: \frac{(5*3)+(10*2)+(15*5)}{(5+3+2)} = 11
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