Choosing the number of bins

A rule of thumb is to take the number of observations and divide by 10, but here you can try doing it interactively:

Try an example from :Here

1. Click on Analyze data.
2. Start by choosing a data set, say baseball. and on the right click on ''accept data set''.
3. Then choose histograms.
4. Choose one of the available variables on the right, say salary.
5. click on update to see the histogram.
6. Try changing the number of bins and clicking update again.

Histogram applets: or here Input your ouwn frequency table

Different forms and shapes of distribution histograms: Examples