Mean of Histograms and Dot Plots

Mean of Histograms and Dot Plots

Mean = Average

How do you find the mean, or range, of a set of data?

• Find the sum of the numbers by adding them.

• Count how many numbers you added together.

• Divide the sum by the number of values in the set.

How do find the mean of a histogram

• Create your data set. Each bar gives you a number in the set. {5, 3, 3, 5}

• Add the numbers: 5 + 3 + 3 + 5 = 16

• There are 4 numbers in the set.

• Divide the sum by 4: 16/4 = 4

• You could also reorganize the stacks to be equal heights of 4 wands.

Multiple Choice

Find the mean of the data in the pictograph.

Each ball = 3 baskets.

• 3.5

• 10.5

• 14

• 15

How do you find the mean of a dot plot?

• Create your data set. Each dot represents the number below. There are 2 dots above the one, so there are two 1s in the set.

• Data Set: {1, 1, 3, 5, 9}

• Find the sum: 1 + 1 + 3 + 5 + 9 = 19

• Divide the sum by 5 because ther 5 numbers (dots) in the set: 19/5 = 3.8