the mean of X + Y observation x- y find the sum of all observations
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21
ANSWER:
Mean =Sum of observayion /total number of observation.
x-y=Sum of observation/x+y.
Sum of observation=(x-y)*(x+y)
Sum of observation=x^2-y^2 .
Mean =Sum of observayion /total number of observation.
x-y=Sum of observation/x+y.
Sum of observation=(x-y)*(x+y)
Sum of observation=x^2-y^2 .
Answered by
6
let us consider sum of observation as z
z÷x+y=x-y
z=(x+y)(x-y)
=xsquare+y square
hope its help you
thanx and be brainly...........................................
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