Question Video: Finding the Mean of a Data Set Using a Bar Graph Mathematics • First Year of Preparatory School

Video Transcript

Liam eats pizza for lunch for 30 days. Some days he eats a small pizza, some other days he eats a medium pizza, and some days he eats a large pizza. Using the bar graph shown, calculate the mean weight of pizza he eats per day.

Recall that the mean of a numerical data set is defined to be the sum of the data points divided by the total number of data points. The data points in our data set are pizzas or, more precisely, their weights. From the bar graph, we can see that there are 10 pizzas weighing 200 grams, 15 pizzas weighing 300 grams, and five pizzas weighing 400 grams, giving us 30 pizzas with a total weight of 8500 grams. The mean pizza weighs 283 grams, to the nearest gram.