the same way you calculate it with the same figures,by adding up the numbers and dividing by the amount of numbers.example is 45+43+12+10=110/4=27.5
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You add together the values and divide by the number of values.
change in y values of 1st and last points divided by the change in x values of the 1st and last points
average
The average of a set of values is the sum of the values divided by the number of values.
I imagine its purpose is to calculate the average of the values A12 and A20. e.g. if A12 = 10 and A20 = 20 the outcome of that formula would then be (10+20)/2 = 15