Unformatted text preview: As a simplifying assumption, we are assuming that all four students in the class received a score of 64.5 points on the test. More generally, we could also assume that the average of the four students’ scores is 64.5 points. (Either assumption will have the same impact on our estimate of the mean.) Either way, our estimate for the sum of the four students’ scores will be: 64.5 + 64.5 + 64.5 + 64.5 = 4 ( ) 64.5 ( ) = 258 points . In general, our estimated “class sum” (i.e., the sum of the scores within a class) is given by f ± x , where f is the class frequency and x is the class mark. We will then add these class sums to obtain our estimate for the sum of all of the scores, f ± x ² ....
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 Fall '09
 KIM
 Statistics, Class Mark

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