The seventh- and eighth-grade classes surveyed 180 of their classmates to help decide which of three options is best to raise money for school activities. Some results of the survey are given here: 66 participants preferred having a car wash.
50 participants preferred having a bake sale.
64 participants preferred having a talent show.
98 participants were seventh graders.
16 seventh-grade participants preferred having a talent show.
15 eighth-grade participants preferred having a bake sale.
a. Complete the two-way frequency table that summarizes the data on grade level and options to raise money.

b. Calculate the row relative frequencies. Round to the nearest thousandth.

c. Is there evidence of an association between grade level and preferred option to raise money? Explain your answer.