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24 February, 11:53

five whole numbers are written in order (4, 6, x, y, 10). The mean and median of the five numbers are the same. Work out the values of x and y.

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  1. 24 February, 15:18
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    x = 7

    y = 8

    Step-by-step explanation:

    Knowing that the mean is equal to the median, we can formulate the following equation:

    ⅕ (4 + 6 + x + y + 10) = x

    Simplifying it, we get:

    y = 4x - 20

    Now, we know that both x and y are between 6 and 10 and that y is greater than x;

    Mathematically, we have the conditions:

    6 = < x = < 10

    6 = < y = < 10

    y > x

    If we apply the second condition, i. e. the restrictions on the y-values, we find that x has to be between 6.5 and 7.5, i. e. 6.5 = < x = < 7.5;

    This means x has to 7 since it can only be a whole number and this is the only whole number between 6.5 and 7.5;

    Once we know this, we can find y simply by subbing it into the equation formulated previously:

    y = 4 (7) - 20

    y = 8
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