8x6= 48 (not necessary to divide by 8 since you'd have to multiply it by 2 anyway because there are 2 triangles)
6x12=72
10x12=120
12x8=96
48+72+120+96=336
336cm^2 is the answer
115 is the outlier, and it results in the mean being lower than it would have been.
ok did you get what I solved I hope it's fine by you, if you have a problem with the way I solved it still ask questions ok