100 students who are in 9th or 10th grade were asked if they participated in at least one extracurricular activity (sports, music, or drama). 40 of the students are in 10th grade, but only 18 of these participate in at least one extracurricular activity. 32 of the 9th grade students participate in at least one extracurricular activity. create a two-way table (a) identify the variable and the categories represented in this problem.

Using the information above, we can make the two-way table below. The key is to fill in the numbers you know and calculate the ones that you don't know.

               Participates      Doesn't Participate        Total
9th                 32                        28                          60

10th               22                        18                          40

Total              54                        46                         100