sum of x+5 observations is x^4-625.Find the mean.
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Number of observations = x + 5.
Sum of observations = x^4 - 625.
We know that Mean = sum of observations/Number of observations
= x^4 - 625/x + 5
= (x^2)^2 - 25^2/x + 5
= (x^2 + 25)(x^2 - 25)/x + 5
= (x^2 + 25)(x^2 - 5^2)/x + 5
= (x^2 + 25)(x + 5)(x - 5)/(x + 5)
= (x^2 + 25)(x - 5).
Note: (a + b)(a - b) = a^2 - b^2
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