The lengths of 62 leaves of a plant are measured in millimetres and the data is represented in the following table :
| Length (in mm) | Number of leaves |
| 118-126 | 8 |
| 127-135 | 10 |
| 136-144 | 12 |
| 145-153 | 17 |
| 154-162 | 7 |
| 163-171 | 5 |
| 172-180 | 3 |
Draw a histogram to represent the data above.
We can see that the intervals are 118-126, 127-135, 136-144...etc
For the interval 118-126: The upper limit is 126
For the interval 127-135: The lower limit is 127
Difference = 127 - 126 = 1
Now, we will subtract 0.5 from all lower limits & add 0.5 to all upper limits
| Length (in mm) | Number of leaves |
| 117.5-126.5 | 8 |
| 126.5-135.5 | 10 |
| 135.5-144.5 | 12 |
| 144.5-153.5 | 17 |
| 153.5-162.5 | 7 |
| 162.5-171.5 | 5 |
| 171.5-180.5 | 3 |
Hence the histogram is :