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 120.1 - 123.8 19 123.9 - 127.6 44 127.7 - 131.4 46 131.5-135.2 29

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