2015年10月概率论与数理统计（经管类）
卷面总分：100分
试卷年份：2015
是否有答案：有
作答时间： 120分钟
设事件A与B互不相容，且P(A)=0.4，P(B)=0.2，则P(A∪B)
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Stack trace:
#0 /data/zikao/sites/www.fjzikao.net/www/phpcms/model/get_model.class.php(59): db_mysqli->fetch_next()
#1 /data/zikao/sites/www.fjzikao.net/www/caches/caches_template/default/content/yzb_exam_detail.php(142): get_model->fetch_next()
#2 /data/zikao/sites/www.fjzikao.net/www/phpcms/modules/yzb/exam.php(293): include('/data/zikao/sit...')
#3 /data/zikao/sites/www.fjzikao.net/www/phpcms/libs/classes/application.class.php(61): exam->detail()
#4 /data/zikao/sites/www.fjzikao.net/www/phpcms/libs/classes/application.class.php(37): application->init()
#5 /data/zikao/sites/www.fjzikao.net/www/phpcms/base.php(251): application->__construct()
#6 /data/zikao/sites/www.fjzikao.net/www/phpcms/base.php(153): pc_base::_load_class('application', 'libs/classes', 1)
#7 /data/zikao/sites/www.fjzikao.net/www/phpcms/base.php(135): pc_base::load_sys_class('application')
in /data/zikao/sites/www.fjzikao.net/www/phpcms/libs/classes/db_mysqli.class.php on line 305
_____.
；（2）当X与Y的相关系数
时，求Cov(2X,Y)；
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