I need help with the calculations please

Experiment VWS-2: The Simple Pendulum Data Sheet mass of wood bob mw = 5.4 8 angle 0 = 20 . Tp = In n Tm Percent Length 2 T Error cm S S S % 80 35. 85 20 60 30. 66 20 40 24. 66 20 20 mass of brass bob mb = 69.04 8 angle 0 = 30 . Tp = In n Im Percent Error Length g cm S S S % 80 36. 15 20 60 31. 16 20 40 25.38 2 0 20