1. Determine the number of successful outcomes. For example, if you were calculating a student's percentage score on a test, you would total the number of correct answers. 2. Determine
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note:the_two_bars_around_the_the_observed_value_accepted_value_resemble_absolute_value_signs. "Percent of discrepancy = l observed value  accepted value l / accepted value X
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If the two numbers are x and y, the formula would be 100 * (absolutevalue( x 
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To calculate standard deviation, compute the difference of each point from the mean & square result. Formula in source. Take care!
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