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Unformatted text preview: Average – measure of central tendency3, 3, 4, 2, 3, 2, 3, 1, 4, 5Mean = total of all/# of numbersMean in example = 10 Percent Error:How different is the observed value from the true value% error = (observed value – true value)/true value x 100 = True value – 1/500 th sec.Observed value = 1/450 th sec% error = (1/450 – 1/500)/ 1/500 x 100 = 11% Percents and Weights:Homework: 50%  80Exam 1: 10%  70Exam 2: 10%  60Final: 30%  75 80 x .5 70 x .1 60 x .1 75 x .3 75.5 = CStudy harder! Ratio:The proportional amount of one quantity in relationship to anotherEx: H2O – ratio of hydrogen to oxygen is 2:18 oreos to 4 oreos – 8:4. Simplify to 2:1 Logarithms: We use log H (exposure) oftenWith logs we can add and subtract rather than multiply or divideTo take log of a number. log(100000) = 5Inverse log: 10^5 = 100000 Plot Comparison:Log graphs are easier to read when the numbers are extremely small....
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 Fall '07
 Salvaggio
 10%, Logarithm, 30%, 11%, 10 Percent

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