The frequency distribution of the marks obtained by the 25 students each of the two sections is given as follows:
| Marks: | 10-20 20-30 | 30-40 | 40-50 | 50-60 |
| Section A: | 2 5 | 10 | 5 | 3 |
| Section B: | 3 7 | 8 | 5 | 2 |
Find which section is more consistent.
To determine which section is more consistent, we can use the concept of variability, which measures the dispersion or spread of the data. One common measure of variability is the variance.
First, we'll find the mean of each section:
For section A: Mean = (2 * 10 ______ ____ _______ ______ _________ ______ ______ _________ _________.
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