Mean: measurement at the maximum height of the curve, it provides an average value but doesn't give use information about the range of values
Standard Deviation: measure of the width of the curve, gives indication of the range either side of the mean. 68% lies within +1 standard deviation, 95% is +2 and 99% is +3
Calculate Standard Deviation
1. Calculate mean value
2. Subtract the mean from each measured value
3. Square all numbers
4. Add the squared numbers together
5. Divide this number by the original
6. Square root the results
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