The mean of the summation of two flow variables will be equal to ____________

The mean of the summation of two flow variables will be equal to ____________ Correct Answer the summation of their mean components

Consider two flow variables which can be decomposed as a=A+a’ and b=B+b’. The mean of their summation means a+b = A+a’+B+b’ But, a’ = 0 and b’ = 0. Therefore, a+b = A+B Also, A = A and B = B. Hence, a+b = A+B.
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