1. The problem statement, all variables and given/known data I have to calculate the propagated error on g of pendulum. I pretty much measured the T of pendulum and now calculating g while increasing the number of cycles. 2. Relevant equations I used the equation of propagated error and i included picture of it and my calculations. 3. The attempt at a solution I plugged all the values into the equation but what bothers me is the size of the error. For 20 cycles I get g=9.776, but my error is 0.02. This seems like a huge error, and would mean that my g would equal to 9.78. Anyone sees any mistake?