2. Frequency and Histograms
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Start by making a frequency table.
To draw a histogram, we will start by making a frequency table.
The minimum value is 9 and the maximum is 22. In this case, intervals of 3 seem reasonable. Let's list the intervals in the first column of our frequency table.
Hours | Frequency |
---|---|
9 - 12 | |
13 - 16 | |
17 - 20 | |
21 - 24 |
Now, let's count the number of values in each interval. 12, 9, 10, 14, 10, 11, 10, 18, 21, 10, 14, 22 Looking at the data, we can see that there are 7 values in the first interval, 2 values in the second interval, 1 value in the third interval, and 2 values in the fourth interval. Now we can complete the second column of our table.
Hours | Frequency |
---|---|
9 - 12 | 7 |
13 - 16 | 2 |
17 - 20 | 1 |
21 - 24 | 2 |