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

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Find the mean of the data in the histogram.

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Find the mean of the histrogram.

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Find the mean, or average, of the histogram.

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Find the mean of the histogram.

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Find the mean of the histogram.

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

Fill in the Blanks

Sometimes Zach's teammates arrive late to basketball practice. The following dot plot show how many times each teammate was late to practice last week.

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Find the mean, or average, of the data in the dot plot.

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Find the mean of the data in the dot plot.

Fill in the Blanks

Find the mean, or average, of the data in the dot plot.

Fill in the Blanks

Find the mean, or average, of the data in the dot plot.

Fill in the Blanks

Find the mean, or average, of the data in the dot plot.