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# EOCT 1 Math

### Random important math stuff

Mean add up all the numbers and then divide by the number of numbers
Median the middle value in the list of numbers
Mode the value that occurs most often
Range the difference between the largest and smallest values
Inter-quartile Range The difference between the 1st quartile and the 3rd quartile
Mean absolute deviation 1) find the mean 2)determine the deviation 3)find the mean of the deviation
Isosceles Two sides are the same length, two angles are the same
Equilateral All three sides are the same length, all angles are too
Scalene all sides are different lengths, all angles are different
Midpoint formula (X2+X1) (Y1+Y2) ------ , -------- 2 2
Distance formula D = square root of (x2-x1)2 + (y2-y1)2