Calculate the simple and weighted average from the following and account for the difference between the two:

Calculate the simple and weighted average from the following and account for the difference between the two:

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The numbers 3.2, 5.8, 7.9 and 4.5 have frequencies x, (x + 2), (x – 3) and (x + 6) respectively. If the arithmetic mean is 4.876, find the value of x.

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