Question

Fifteen 7th graders were asked how many hours they spend doing homework each week and how many hours they spend watching television each week. the results are shown in the dot plots below

Answer 1

A.

• 18 > 14, true

B.

• 12 - 16 = -4, true

C.

Mean:

• Homework = (4 + 6*2+10*3+12*2+14*4+16*2+18)/15 = 11.73
• Television = (0 + 10*3+12*1+16*3+18*4+20*3)/15 = 14.8

The difference:

• 14.8 - 11.73 > 1, NOT true

D.

• True