Question

these class boundaries are used as dividers for the bars on the histogram. each class boundary is represented on the horizontal axis below. at the center of each interval is a point represented by a large black dot. drag the five dots to the correct heights for the bars of the histogram. note: if any frequency is zero (0), drag its bar up a bit, then back down to zero so that the value is registered.

Explanation:

Step1: Understand the Task

We need to set the height of each dot (representing the center of a class interval) to the frequency of that interval. Here, all frequencies are 0, so we follow the note: drag each dot up a bit and then back down to 0 to register the value.

Step2: Adjust Each Dot

For each of the five dots (at the centers of the intervals), interact with them: drag up slightly and then back to the y - value of 0 (since frequency is 0). This ensures the system registers the frequency as 0 for each interval.

Answer:

Each of the five dots (at the centers of the intervals 6.65 - 8.35, 8.35 - 10.05, 10.05 - 11.75, 11.75 - 13.45, 13.45 - 15.15) should be set to a height of 0 (after dragging up and back down as per the note) on the y - axis.