题目内容

Listen to the following dialogue and answer the questions that follow. What is the most probable relationship between the speakers: teacher and student, doctor and patient or just friends? ______________.

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Among the stop consonants, /p/, /t/ and /k/ are the voiced sounds with the vibrating of the vocal cords.

A. 对
B. 错

正态分布不具有（）所述的特征。

A. 左右对称
B. 单峰分布
C. 中间大两头小
D. 概率处处相等

一个变量服从标准正态分布，若截取右半边，则变量的平均数约为（）。

A. 0
B. 0.25
C. 0.8
D. 1.5

正态分布曲线共有个拐点。

A. 0
B. 1
C. 2
D. 3