I just need help with the last column on the data table and percentage error

Time Interval Average Acceleration Time of Gravity g Distance Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 0.20 m 22sec 20sec 21sec 21sec 20sec 20.8sec m/sec2 0.40 m 25sec 23sec 24sec 23sec 22sec 23.4sec m/sec2 0.60 m 29sec 27sec 27sec 28sec 28sec 27.8sec m/sec2 0.80 m 33sec 32sec 31sec 33sec 32sec 32.2sec m/sec2 1.00 m 36sec 36sec 35sec 37sec 36sec 36sec m/sec2 Comments: Average: m/sec2 If the accepted value of the acceleration due to gravity is g = 9.81 m/s2, calculate the percentage error of your measured value. accepted value - measured value Percent error = *100% accepted value