At least 2 and up to 5.
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The points are marked between the numbered tick marks which represent whole values.
There are 15 values.
Ask the math teacher
If you have between about 15 and 50 pieces of data, a stem-and-leaf plot is not tedious to make and will illustrate the distribution of the values. Once you have made a stem-and-leaf plot, it is easy to locate the median.
Go into your data to determine which values are outliers and if they're significant and random (not an apparent group), eliminate them. This will take them out of your boxplot.