设X是随机变量．已知P(X≤1)=0.3，P(X≥2)=0.4，则P(1＜X＜2)等于______．
0.2
0.3
0.4
0.7
[解析] 由P(X＜2)=1-P(X≥2)=0.6得P(1＜X＜2)=P(X＜2)-P(X≤1)=0.6-0.3=0.3