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Sine ira means "without anger".
It means 550-330 years before common era. BCE stands for before common era.
Two numbers are needed to find a mean.
First,find the mean of the set. Then,find the differences between every item and the mean Square them Find the mean of the squared differences The square root of that is the standard deviation
Three steps:1. Find the mean of all values2. Find the distance of each value from that mean (subtract the mean from each value, ignore minus signs)3. Then find the mean of those distances