简答题:X～N(μ，σ2)，若已知P{X<9}=0．975，P{X<2}=0．062，求μ及σ2的值， <br /> (附：<img src="http://www.weimei168.com/uploads/202208/161223734845271.png" width="22" height="20" />(1．96)=0．975，<img src="http://www.weimei168.com/uploads/202208/161223735438291.png" width="22" height="20" />(1．54)=0．938)