问题
单项选择题
You are working on a software development project and there is 60% probability that development will be completed by the planned date and 70% probability that testing will be completed by the planned date．What is the probability that development and testing will be completed as per schedule ？（）
A．65%．
B．42%．
C．66%．
D．63%．
答案
参考答案：B
解析：
你工作在一个软件开发项目上，开发工作有60%的概率按计划日期完成；测试工作有70%的概率按计划日期完成。开发和测试工作都按照计划日期完成的概率是多少 A) 65%。 B) 42%。 C) 66%。 D) 63%。 开发和测试同时按计划完成的概率是：60%×70%=42%。