The ages of the people who came to a birthday party are shown below.

A graph shows years labeled 0 to 20 thru 81 to 100 on the horizontal axis and frequency on the vertical axis. 0 to 20 years at frequency 5. 21 to 40 years at frequency 13. 41 to 60 years at frequency 8. 61 to 80 years at frequency 3. 81 to 100 years at frequency 2.
Which statements must be true according to the histogram? Check all that apply.

The data is qualitative.
The data is skewed right.
There were 31 people at the party.
There were children at the party.
The most common age of the attendees was 13 years old.
The majority of the people at the party were less than 61 years old.