Question

.The sum of (x + 5) observations is x

4 – 625. Find the mean of the observations​

Answer 1

Answer:

sum of x+5 observations =x⁴-625

mean =sum of observations/no of observations

= x⁴-625/x+5

=(x²-25)(x²+25)/x+5

=(x-5)(x+5)(x²+25)/x+5

=(x-5)(x²+25)

=x³+25x-5x²-125

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