researchers carried out a survey of fourth-, fifth-, and sixth-grade students in michigan. students were asked whether good grades, athletic ability, or being popular was most important to them. this two-way table summarizes the survey data. grade most important 4th grade 5th grade 6th grade total grades 49 50 69 168 athletic 24 36 38 98 popular 19 22 28 69 total 92 108 135 335 suppose we select one of these students at random. define events a: athletic ability is most important and f: fifth-grade.