已知离散型随机变量X服从二项分布，且期望E(x)=2.4,方差D(X)=2.16,则其参数n,p的值为（）
A. n=4,p=0.6
B. n=6,p=0.4
C. n=8,p=0.3
D. n=24,p=0.1
期望刻画了随机变量的平均水平，方差刻画了随机变量的离散程度。
A. 对
B. 错
What is a group interview?
A. It is done with a group of people.
B. It is a traditional one-on-one interview.
C. It is very economical and time-saving for interviewers.
D. It helps interviewers conduct an initial screening of the candidates as they observe the candidates’ behavior and interaction with each other.
For a candidate group interview, what interviewers look for in candidates are:
A. leadership
B. team spirit
C. personal traits and levels of individual knowledge
D. communication skill
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