Question

fIND the mean proprotion of (x+y)² and (x-y)²
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Answer 1

Answer:

Step-by-step explanation:

If mm is the mean proportion of aa and bb, then it means that a,m,ba,m,b are in geometric progression. In other words,

ma=bmma=bm

This means that

m2=abm2=ab

⟹m=±ab−−√⟹m=±ab

So, in the given case, the mean proportion is

±(x+y)2(x−y)2−−−−−−−−−−−−−√±(x+y)2(x−y)2

=±(x2−y2)

Answer 2

Answer:

Step-by-step explanation:

Mean=sum of observations/no of observations

Mean=(x+y)²+(x-y)²/2

=>x²+y²+2xy+x²+y²-2xy/2

=>2(x²+y²)/2

Mean=>x²+y²