Question

find the mean of the observations .
please solve it I will mark as brainlist if your answer will be right .​

Answer 1

Answer:

Step-by-step explanation:

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 !