Estimating The Mean From A Grouped Bar Chart. Example Estimate The mean Amount Of Hours Of Homework

In this video you will be shown how to find out the mean average from a grouped bar chart. First find out the frequency of each bar (how many are in each group). Next find the midpoints of each group. This is the number half way between. Next multiply the midpoints of each bar by the frequency. Add these numbers up and divide this answer by the total frequency.

In the example shown you need to estimate the mean amount of time spent of 30 students on their homework.