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Calculate the sample mean and sample variance for the following frequend necessary, round to one more decimal place than the largest number of de

Calculate the sample mean and sample variance for the following frequend necessary, round to one more decimal place than the largest number of de Hourly Wage Class 6.51-8.50 8.51-10.50 10.51-12.50 12.51 14.50 14.51-16.50

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