10名同学的语文和数学成绩如表: 语文和数学成绩的均值分别记为E1和E2,标准差分别记为σ1和σ2,则
A E<sub>1</sub>>E<sub>2</sub>,σ<sub>1</sub>>σ<sub>2</sub> B E<sub>1</sub>>E<sub>2</sub>,σ<sub>1</sub><σ<sub>2</sub> C E<sub>1</sub>>E<sub>2</sub>,σ<sub>1</sub>=σ<sub>2</sub> D E<sub>1</sub><E<sub>2</sub>,σ<sub>1</sub>>σ<sub>2</sub> E E<sub>1</sub><E<sub>2</sub>,σ<sub>1</sub><σ<sub>2</sub>