To find the mode of the lengths of the commercials, we need to identify the value that appears most frequently in the list. The lengths of the commercials are:
- 71 seconds
- 66 seconds
- 61 seconds
- 73 seconds
- 73 seconds
Now we can tally the occurrences of each length:
- 61 seconds: 1 time
- 66 seconds: 1 time
- 71 seconds: 1 time
- 73 seconds: 2 times
The length that appears most frequently is 73 seconds, which appears 2 times.
Therefore, the mode of the lengths of the commercials is 73 seconds.