3. Measures of Central Tendency and Dispersion
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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 12 and the maximum value is 84. In this case, intervals of 20 seem reasonable. Let's list the intervals in the first column of our frequency table.
Number of Cars | Frequency |
---|---|
0 - 19 | |
20 - 39 | |
40 - 59 | |
60 - 79 | |
80 - 99 |
Now we should count the number of values in each interval. 53, 84, 22, 38, 41, 27, 25, 12 , 17 , 27, 33, 41, 60, 73, 62, 59, 43 Looking at the data, we can see that there are 2 values in the first interval, 6 values in the second interval, 5 values in the third interval 3 value in the fourth interval, and 1 value in the fifth interval. Using this information we can complete the second column of our table.
Number of Cars | Frequency |
---|---|
0 - 19 | 2 |
20 - 39 | 6 |
40 - 59 | 5 |
60 - 79 | 3 |
80 - 99 | 1 |