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Calculate the sample mean and sample variance for the following frequency distribution of heights in centimeters...

Calculate the sample mean and sample variance for the following frequency distribution of heights in centimeters for a sample of 8-year-old boys. If necessary, round to one more decimal place than the largest number of decimal places given in the data.

Heights in Centimeters
Class Frequency
117.1 - 120.8 14
120.9 - 124.6 20
124.7 - 128.4 40
128.5 - 132.2 44
132.3 - 136.0 26
Math   Statistics-And-Probability   
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Answer #1

117.1 - 120.8 14 118.95 1665.3 14149.10 198087.435
120.9 - 124.6 20 122.75 2455 15067.56 301351.250
124.7 - 128.4 40 126.55 5062 16014.90 640596.100
128.5 - 132.2 44 130.35 5735.4 16991.12 747609.390
132.3 - 136.0 26 134.15 3487.9 17996.22 467901.785

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