I wonder _________ they'll have the races again next year.
A:what
B:how
C:why
D:if
甲
乙
丙
丁
平均数(cm)
185
180
方差
3.6
7.9
8.2
(Ⅰ)求证:f(x)≥8恒成立;
(Ⅱ)求使得不等式f(1)>10成立的实数m的取值范围.