易错点扫描“可能”与“非等可能”不清致误.混淆了“互斥事件”与“独立事件”.混淆了“互斥事件”与“对立事件”.“有序”与“无序”混同,导致基本事件的个数求错.混淆“无放回抽取”与“有放回抽取”而出错.忽视对所求出的离散型随机变量的分布列的检验,期望和方差的计算出现错误.易错题诊断例1掷一对不同颜色的均匀的骰子2次,计算点数和大于7的概率 Error-prone scan “may ” and “non-may ” unclear error confused “mutual exclusion event ” and “independent event ” confused “mutual exclusion event ”Opposite event “. ”Ordered “ and ”Disorder “ confused, resulting in the number of basic events wrong. Confusion ”no back to withdraw “ and ”back to withdraw " error . Neglecting the calculation of the test, expectation and variance of the distribution of the discrete random variables found is wrong Error-prone test 1 Throw a uniform pair of dice of different colors 2 times to calculate the probability of points and greater than 7