When data is represented graphically we must know how to
read and interpret the data.
Data may be represented with pictographs, bar graphs,
histograms, line graphs, double line graphs, double bar graphs or circle
graphs.
For this lesson we will take a look at a double bar
graphs and examples of some questions that might be asked.

What is being compared
in this graph?
Five groups predicted how many m&m's were in a bag then
actually counted them. This graph compared the
prediction of each group to the actual count.

What is the mean,
median, mode and range of both sets of data?
Prediction
Actual
Mean 
37.4
50
Median 
37
50
Mode 
no mode
52
Range 
25
5

What was the highest
prediction and which group made that prediction?
50 m&m's, Group 3

What was the lowest
actual count and which group had that count?
47 m&m's, Group 2

Let's do some
practice problems.
