EXPLANATION
Let's see the facts:
As we can see on the table, we need to find the average and compare it with the class average as shown as follows:
Sum of opp/hyp= 2.4985
Number of terms= 5
Mean of opp/hyp= 2.4985/5 = 0.4997
Sum of adj/hyp = 0.8627 + 0.8659 + 0.863+ 0.8635 + 0.864 = 4.3191
Number of terms= 5
Mean of adj/hyp = 4.3191/5= 0.86382
Sum of opp/adj = 0.5795+ 0.5775 + 0.5794 + 0.5773 + 0.5787 = 2.8924
Number of terms:
Mean of opp/adj = 2.8924/5 = 0.57848
The class averages are:
opp/hyp adj/hyp opp/adj
0.499703260 0.863819660 0.57848184
The class average is consistent with what i have calculated.
It's because the relationship between sides in the triangles are the same.