Question

Gina is finding the equation of the median-median line for the data set below.
What should she use for the summary points?

minutes studying(x) 0 5 10 10 15 20 25 30 30
test score(y) 68 61 54 64 73 76 80 79 85


Group 1: (10, 61); Group 2: (15, 64); Group 3: (30,80)
Group 1: (5, 61); Group 2: (15, 73); Group 3: (25, 79)
Group 1: (10, 54); Group 2: (20, 76); Group 3: (30, 79)
Group 1: (5, 61); Group 2: (15, 73); Group 3: (30, 80)