What can be concluded from this data of a free fall experiment? (the object was a small ball)

Distance d (m) Time t (s) g = 2d/(t^2) g (m/s^2) 0.5 0.321 2(0.5)(0.321)^2 9.70 0.6 0.3536 2(0.6)(0.3536)^2 9.60 0.7 0.3808 2(0.7)/(0.3808)^2 9.65 0.8 0.4059 2(0.8)/(0.4059)^2 9.71 0.9 0.4315 2(0.9)(0.4315)^2 9.67 Average of g = 9.67