To determine the total number of people who participated in the survey, we need to find the frequency of responses for each interval on the histogram's x-axis ('Time to Fall Asleep') and sum these frequencies.
Based on the description, if we assume each bar on the histogram represents the following frequencies:
- 4 to 7 minutes: 2 people
- 7 to 10 minutes: 3 people
- 10 to 13 minutes: 1 person
- 13 to 16 minutes: 4 people
- 16 to 19 minutes: 2 people
- 19 to 22 minutes: 2 people
- 22 to 24 minutes: 0 people
We add these frequencies together:
- 2 + 3 + 1 + 4 + 2 + 2 + 0 = 14
Thus, the total number of people who participated in the survey is 14.
However, if the specific frequency counts for the histogram were provided in the original question, please refer to those exact numbers for accurate calculation. If each frequency sums up to a different total number, adjust accordingly based on the actual frequencies presented in the histogram image.