设某公共汽车从上午7时起每15分钟来一班车,如果某乘客到达车站的时间是7:00到7:30之间均匀分布的随机变量，则该乘客候车时间不超过5分钟的概率为（填最简分数）
若a在(1,6)上服从均匀分布，则x2+ax+1=0有实根的概率为 （填最简分数）
Conversation OneQuestions 8 to 11 are based on the conversation you have just heard.Question 8
A. She received a bonus unexpectedly.
B. She got a well-paying job in a bank.
C. She received her first monthly salary.
D. She got a pay raise for her performance.
Question 9
A. Two decades ago.
B. Several years ago.
C. Just last month.
D. Right after graduation.
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