1. The problem statement, all variables and given/known data Statement 1: Average value of AC over a complete cycle is always zero. Statement 2: Average value of AC is always defined over half cycle. We need to tell whether these two statements are right, and if 1 is right then whether 2 is its explanation. 2. Relevant equations Well arithmetic mean = integral f(x)dx/ integral dx root mean sqaure = root( integral f(x)^2 dx/ integral dx) 3. The attempt at a solution I think both are false since it depends upon the type of mean we are taking. Arithmetic would be zero and root mean square non zero. And I think we take mean over complete cycle only. But my answer is wrong.