Answer:
Tyler. Because the temperature dropped at a faster °/hr rate then Mai's did
Explanation:

Tyler
from 4-6 it dropped 8° in a course of 2 hours. averaging a 4°/Hr drop
= 4°/hr
Mai
from 6-10 it dropped 9° in a course of 4 hours. averaging a 2.25°/hr drop
= 2.25°/hr
Therefore Tyler is correct