Final Answer:
To determine the number of students who spent less than 30 minutes on homework from Roberto's histogram, specific data or context about the histogram is needed.
Step-by-step explanation:
The question provides the context of Roberto making a histogram to record the time students spent on homework. However, the exact information about the intervals in the histogram, the frequency of each interval, or the total number of students is not provided. Without this information, it's not possible to give a precise answer to how many students spent less than 30 minutes on homework.
A histogram typically consists of bars representing intervals of data, and the height of each bar corresponds to the frequency or count of data points within that interval. To find the number of students who spent less than 30 minutes, it would be necessary to identify the bars corresponding to intervals below 30 minutes and sum up their frequencies.
In conclusion, without specific details about the intervals and frequencies in Roberto's histogram, an accurate answer cannot be provided. It highlights the importance of having complete information or context when interpreting data from a histogram.