Question: 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

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.

ClassFrequency
121.6-125.225
125.3-128.926
129.0-132.624
132.7-136.319
136.4-140.026

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