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The z-score basically tells you how many std deviations you are from the mean
z = x-mean/stdev
mhm i get that much. its the algebraic part - the steps that i have trouble with. the entire thing equals one, yes?
yes the area under the entire bell curve is 1.
the area under the curve from z-scores -1 to 1 is about 0.68
the area under the curve from z-scores -2 to 2 is about 0.95
the area under the curve from z-scores -3 to 3 is about 0.99
say you have a bunch of data with mean = 10, std deviation = 2
say x = 6 and 14
z = (6-10)/2 = -2 , z = (14-10)/2 = 2
The probability of finding a data point between 6 and 14 is 95%
ohh ok. thanks! that makes sense :) math is not a strong suit....
the example helps too