Question

mean of a+b terms in a given data is a-b then find the sum of terms

Answer 1

mean = (a+b)×(a-b)=
${a}^{2} - {b}^{2}$
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Answer 2

Answer:

a²- b²

Step-by-step explanation:

Given , no.of items = (a+b)

mean = a-b

mean = sum of observations/no.of observations

a - b = sum/ a+b

* multiplying (a+b) on both sides

sum = (a-b)×(a+b)

= a² - b²