A1 f Hours of Sleep B С C E F G H I J K I M N 1 A Hours of Sleep 6 2 3 5 10 4 5 au 6 7 9 8 9 9 5 9 10 11 12 13 5 8 7 8 1

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Note: this is a question with 3 parts
A1 f Hours of Sleep B С C E F G H I J K I M N 1 A Hours of Sleep 6 2 3 5 10 4 5 au 6 7 9 8 9 9 5 9 10 11 12 13 5 8 7 8 14 15 16 17 18 19 20 o o oo o o o Data
A1 Hours of Sleep A B с G E F G H I J K M N 8 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Data Gho
DATAfileSleep U.S. companies lose $63.2 billion per year from workers with insomnia. According to a 2013 article in the Wall Street Journal, workers lose an average of 7.8 days of productivity per year due to lack of sleep. The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 6 5 10 5 5 8 7 8 6 9 8 9 6 10 8 (a) What is the mean number of hours of sleep for this sample? h (b) What is the variance? Standard deviation (in h)? (Round your answers to two decimal places.) variance standard deviation h