Well we started out with mental math like usual, then added from yesterday about the different tools to find standard deviation on ronblond.com. He then showed us what a Z-score is. Its a normalized or standardized score that consiters relative ranking in terms of mean and standard deviation. Then he showed us an ancient hand held tool called a slide-rule and showed us by hand how nasty the numbers are when doing standard deviation by hand. questions 2 and 8 are for homework from the booklet.
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