Question

The sum of (x+5) observations is (x3 +125). Find the mean of the observations.

Answer 1

the mean of the observation is 3

Answer 2

Number of observation = x + 5

Sum of observation = x³ + 125

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Mean = Sum of observation ÷ Number of observation

$\text {Mean = }\dfrac{x^3 - 125}{x + 5}$

$\text {Mean = }\dfrac{x^3 - 5^3}{x + 5}$

$\text {Mean = }\dfrac{(x + 5)(x^2- 5x +25) }{x + 5}$

$\textbf {Mean = }x^2- 5x +25$

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