Find and interpret the marginal frequencies.

A two-way table shows students of junior class and senior class who attend or does not attend school play. The number of students of junior class and senior class who attend the school play is 41 and 52 respectively. The number of students of junior class and senior class who does not attend the school play is 30 and 23 respectively.
students are juniors.

students are seniors.

students attend the school play.

students do not attend the school play.

students were surveyed.