4. Two ewmeters are connected in series. Let ml, m1. be the readings of meters A. B respectively. Assuming that both meters are unbiased and that the precision cf meter A is i3lbtr and that of meter B i 5 lbfhr. nd the least squares estimate of the total ow. Below is the answer for the question, as given by the book, but I am confused on how to solve it to get the