1 A researcher collects data concerning the number of different social media platforms used by school pupils on a typical weekday.
The frequency table for the data is shown below.
| Number of different social media platforms | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Frequency | 2 | 5 | 9 | 15 | 8 | 5 | 4 | 1 |
The researcher uses software to represent the results in this diagram.
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- Explain why this diagram is inappropriate.
- Calculate the following for the number of social media platforms used:
- the mean,
- the standard deviation.