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Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American adults, if necessary, round to

Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American adults, if necessary, round to one more decimal place than the largest number of decimal places given in the data. Heart Rates in Beats per Minute Class Frequency 51-58 7 59-66 13 67-74 75-82 5 83-90 3

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