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  1. #1
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    Average

    The average of 5 results is 46 and that of first 4 is 45.The fifth result is
    (a)1
    (b)10
    (c)12.5
    (d)50
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  2. #2
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    Hello,
    Quote Originally Posted by devi View Post
    The average of 5 results is 46 and that of first 4 is 45.The fifth result is
    (a)1
    (b)10
    (c)12.5
    (d)50
    The average of 5 results is given this way :

    A=\frac{a+b+c+d+e}{5}, where a,b,c,d,e are the results. In general, you divide the sum of the results by the number of results.

    We know that the sum of the first 4 is 45, let's say a+b+c+d=45 and that the average is 46.

    46=\frac{45+e}{5}

    Solve for e...
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  3. #3
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    solve it

    e+45=46
    46-45=e
    e=1
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