At least 50% of the students volunteered between 15 and 30 hours.
The box plot provides a visual representation of the distribution of community service hours volunteered by students at Javi's school. In this context, the box in the box plot represents the interquartile range (IQR), which encompasses the middle 50% of the data. The lower boundary of the box corresponds to the first quartile (Q1), indicating the 25th percentile, and the upper boundary corresponds to the third quartile (Q3), representing the 75th percentile.
For the given question regarding the percentage of students volunteering between 15 and 30 hours, we can observe that this range falls within the interquartile range of the box plot. Since the IQR covers the middle 50% of the data, we can confidently state that at least 50% of the students volunteered between 15 and 30 hours. This is because any subset within the IQR will contribute to this percentage, and 50% is the minimum value for this interval in a box plot.