High school students from grades 9-10 and 11-12 were asked to choose the kind of band to have play at a school dance: rap, rock, or country.

their choices were as follows:
grades 9-10—rap: 40; rock: 30; country: 55
grades 11-12—rap: 60; rock: 25; country: 35

which of the following is a correct two-way frequency table for the data?

a)
band preference for school dance
rap rock country row totals
grades 9-10 0.28 0.21 0.38 0.86
grades 11-12 0.41 0.17 0.24 0.83
column totals 0.69 0.38 0.62 1

b)
band preference for school dance
rap rock country row totals
grades 9-10 0.40 0.55 0.61 0.86
grades 11-12 0.60 0.45 0.39 0.83
column totals 1 1 1 1

c)
band preference for school dance
rap rock country row totals
grades 9-10 40 30 55 125
grades 11-12 60 25 35 120
column totals 100 55 90 245

d)
band preference for school dance
rap rock country row totals
grades 9-10 0.32 0.24 0.44 1
grades 11-12 0.50 0.21 0.29 1
column totals 0.69 0.38 0.62 1