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Math Help - Finding the arithmetic mean

  1. #1
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    Finding the arithmetic mean

    If we have five numbers :X,Y,Z,L,k,the arithmetic mean between X,Y,Z is equal to 8,and the arithmetic mean between X,Y,Z,L,K is equal to 7,what is the arithmetic mean between L,K?
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  2. #2
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    Re: Finding the arithmetic mean

    \frac{X+Y+Z}{3}=8

    \frac{X+Y+X+L+K}{5}=7
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  3. #3
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    Re: Finding the arithmetic mean

    So the answer is 5,5?
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  4. #4
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    Re: Finding the arithmetic mean

    I would write 5.5 but yes, 5,5 in France and elsewhere I believe..
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