Question: Why did he take the average this way? He could just add all the numbers to each other than multiplies by their count. And when

Why did he take the average this way? He could just add all the numbers to each other than multiplies by their count. And when I did it I got a different answer. (10+15+13+9+32+10+25+0)/8= 6982.5. I would really appreciate an explanation.

Why did he take the average this way? He could just add

the scale is 1:7,500 1CM on the map =7500CM in arears 1CM=75CM Step 2/4 (i) Average height rule: Take average height of two sides for each area h1=210+15=12.5cmh2=215+13=14cmh3=213+9=11cmh4=29+32=20.5cmh5=232+10=21cmh6=210+25=17.5cmh7=225+0=12.5cmthereforetotalareaincm2=h110+h210+h310+h410+h510+h610+h710area=12.570+1470+1170+20.570+2170+17.570+12.570area=7,630cm2V

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