Question

If A is the arithmetic mean of the numbers a and b , then which of the following is not correct ? * 1 point A=(a-b)/2 A=(a+b)/2 A-a=b-A a-A=A-b

Answer 1

Answer:

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Answer 2

Arithmetic mean(A) of numbers a  and b

Definition:

Arithmetic mean is the average set of numerical values,calculated by adding them together and dividing by the number of items in the set .

Step-by-step explanation:

Here the numbers are a and b,so the arithmetic mean A is given by

$A=\frac{(a+b)}{2}$

So the second option is correct ,but the question is to find the incorrect one ,hence the other three options are incorrect , that is $A=\frac{(a-b)}{2}$ , $A-a=b-A$ and $a-A=A-b$.

Therefore,the incorrect options are $A=\frac{(a-b)}{2}$,$A-a=b-A$ and $a-A=A-b$