Answer: Michael's median
Explanation:
Michael's grades mean (%) = data's sum(80+76+...)/total data (7)
80+76+73+70+40+25+10/7
374/7
53.4% (right)
Michael's grades median (%) = (data's sum + 1)/2
(374 + 1)/2
data - 187 and data - 188
= 73% (wrong)
Melissa grades mean (%) = data's sum(88+83+...)/total data (7)
503/7
71.85% = 71.9% (right)
Melissa grades median (%) = (data's sum + 1)/2
(503+1)/2
504/2
data - 252
= 70% (right)