According to a 2022  article from the Sleep Foundation, sleep deprivation of workers in the United States results in productivity losses of more than $136  billion per year. The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. Click on the datafile logo to reference the data.   The datafile logo.   6 5 10 5 6 9 9 5 9 5 8 7 8 6 9 8 9 6 10 8 a. What is the mean number of hours of sleep for this sample (to 1 decimal)? b. What is the variance? Standard deviation (to 2 decimals)? Variance   Standard deviation

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