I computed the psd as 2.83 and got it wrong Please help

Level N Mean StDev A 6 10.200 2.672 B 5 16.800 2.168 C 4 10.800 2.387 Source DF SS MS F P Groups 2 135.72 67.86 11.37 0.002 Error 12 71.59 5.97 Total 14 207.31 What is the pooled standard deviation? What degrees of freedom are used in these means and differences in means? Round your answer for the pooled standard deviation to two decimal places. The pooled standard deviation is degrees of freedom= * 2 Answer *1: the absolute tolerance is +/-0.01 Answer *2: exact number, no tolerance