Question

Q6. The sum of (x + 3) observations is
(x4 - 81). Find the mean of the
observations. ---​

Answer 1

Answer:

Sum of (x + 3) observations = (x⁴ - 81)

Mean = x⁴ - 81 / x -3

          = (x²)² - (9)² / x -3

          = (x²-9)( x²+9) / x -3

          = (x+3) (x-3) (x²+9) / x -3

          = (x-3) ( x²+9)

∴ (x-3) ( x²+9) is the mean ! 

hope this helps u! 

 

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