The professor collected the data described in the previous question, and the results were as follows: Group 1 expected As or Bs. There were 9 students in this group, their average was 3.889 and their variance was 2.861. Group 2 expected Cs, Ds, or Fs. There were 7 students in this group. Their average was 3.571 and their variance was 2.952. Calculate the pooled variance. Round your answer to the nearest hundredth if needed