Question

the sum of (x+3) observations is (x^4-81).Find mean of observations

Answer 1

Hi ,

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mean = ( sum of the observations)/( number of

observations )

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Now ,

Sum of the observations = ( x⁴ - 81 )

= ( x⁴ - 3⁴ )

= ( x² )² - ( 3² )²

= ( x² + 3² )( x² - 3² )

= ( x² + 9 )( x + 3 )( x - 3 ) ----( 1 )

Number of observations = ( x + 3 ) ---( 2 )

mean = ( 1 )/( 2 )

= [ ( x² + 9 )( x + 3 )( x - 3 )]/( x + 3 )

= ( x² + 9 ) ( x - 3 )

I hope this helps you.

: )

Answer 2

hope it will helps you......

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