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

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)

Question

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

anonymous · Answer

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anonymous · Answer

I thought the answer would be (5, 61), (15, 73), and 30, 79) but that is not a choice. 
Any ideas?

amistre64 · Answer

how do we define summary points?

anonymous · Answer

Summary points are the medians of the x- and y-coordinates of each group.

amistre64 · Answer

yeah, and something about breakinng into thrids right?

amistre64 · Answer

the median of all x and y values in a group .... or the group entotal?

amistre64 · Answer

5,5,10,10  of the xs in group 1 has a median value of 7.5 if memory serves

anonymous · Answer

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