随着高考命题改革的逐步深入和完善,对一类开放型、探索型问题的考查,由九十年代开始的具有生活背景和数学背景,以数学建模为特征的应用题,逐步转变为以概率、期望、方差、分布列为载体的应用题型.这类应用题生活背景熟悉,数学趣味浓厚,难度适 With the gradual deepening and perfection of the college entrance examination proposition reform, the examination of a type of open-ended and exploratory-type problems has gradually changed from the application problems characterized by life and mathematics background and mathematical modeling starting from the nineties to Probability, expectation, variance, distribution as a carrier of the application of such questions familiar with the background of life, mathematical fun, difficult to adapt