The following data provided are the average hours fifty-six grade 8 students spent doing their homework every school week last school year 2020-2021. The lowest number of hours recorded is 5 hours (every 5 school days), and the highest is 34 hours. The table’s class interval is 5, and the mean is 18.9   HOURS FREQUENCY 5-9 3 10-14 8 15-19 23 20-24 11 25-29 9 20-24 2   Find the range Find the variance and standard deviation   excel file or with steps how to do it in excel

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