）Would you like to go _____________?

A．anywhere relaxing

B．relaxing somewhere

C．somewhere relaxing

D．somewhere relaxed

设X～N(1，4)，从总体X中抽取简单随机样本X₁，X₂，…，X₉，样本均值为

．
(Ⅰ) 求

；
(Ⅱ) 已知

，求常数k．
(附：标准正态分布函数值φ(1.23)=0.8907，φ(1.5)=0.9332，φ(1.77)=0.9616．)