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2023年高考数学二轮复习(全国版理)第2部分考前回扣回扣6 概率与统计_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考数学二轮复习讲义+课件(全国版理科)

  • 2026-03-10 03:59:45 2026-03-10 03:59:45

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2023年高考数学二轮复习(全国版理)第2部分考前回扣回扣6 概率与统计_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考数学二轮复习讲义+课件(全国版理科)
2023年高考数学二轮复习(全国版理)第2部分考前回扣回扣6 概率与统计_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考数学二轮复习讲义+课件(全国版理科)
2023年高考数学二轮复习(全国版理)第2部分考前回扣回扣6 概率与统计_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考数学二轮复习讲义+课件(全国版理科)
2023年高考数学二轮复习(全国版理)第2部分考前回扣回扣6 概率与统计_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考数学二轮复习讲义+课件(全国版理科)

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回扣 6 概率与统计 1.分类加法计数原理 完成一件事有两类不同方案,在第1类方案中有m种不同的方法,在第2类方案中有n种不 同的方法,那么完成这件事共有N= m + n 种不同的方法. 2.分步乘法计数原理 完成一件事需要两个步骤,做第1步有m种不同的方法,做第2步有n种不同的方法,那么 完成这件事共有N= m × n 种不同的方法. 3.排列 (1)排列的定义:从n个不同元素中取出m(m≤n)个元素,并按照一定的顺序排成一列,叫做 从n个不同元素中取出m个元素的一个排列. (2)排列数的定义:从n个不同元素中取出m(m≤n)个元素的所有不同排列的个数,叫做从n 个不同元素中取出m个元素的排列数,用符号 A 表示 . (3)排列数公式:A= n ( n - 1)( n - 2) … ( n - m + 1) . (4)全排列:把n个不同元素全部取出的一个排列,叫做n个元素的一个全排列,A= n × ( n - 1 ) × ( n - 2 ) ×…× 3 × 2 × 1= n ! .排列数公式写成阶乘的形式为A=,这里规定0!=1. 4.组合 (1)组合的定义:从n个不同元素中取出m(m≤n)个元素合成一组,叫做从n个不同元素中取 出m个元素的一个组合. (2)组合数的定义:从n个不同元素中取出m(m≤n)个元素的所有不同组合的个数,叫做从n 个不同元素中取出m个元素的组合数,用符号 C 表示 . (3)组合数的计算公式:C===,由于0!=1,所以C=1. (4)组合数的性质:①C= C ; ②C=C+C. 5.二项式定理 (a+b)n= C a n + C a n - 1 b 1 + … + C a n - k b k + … + C b n (n∈N*). 这个公式叫做二项式定理,右边的多项式叫做(a+b)n的二项展开式,其中各项的系数 C(k∈{0,1,2,…,n})叫做二项式系数.式中的 C a n - k b k 叫做二项展开式的通项,用T 表示, k+1 即通项为展开式的第k+1项:T = C a n - k b k. k+1 6.二项式系数的性质 (1)对称性:与首末两端“等距离”的两个二项式系数相等,即 C = C . (2)增减性与最大值:二项式系数先增后减,中间一项或两项的二项式系数最大.二项式系 数为C,当k<时,C随k的增加而增大;由对称性知,当k>时,C随k的增加而减小.当n是偶数时,中间的一项 取得最大值; 当n是奇数时,中间的两项 和 相等,且同时取得最大值. (3)各二项式系数的和 (a+b)n的展开式的各个二项式系数的和等于2n, 即C+C+C+…+C+…+C= 2 n . 二项展开式中,偶数项的二项式系数的和等于奇数项的二项式系数的和,即 C+C+C+… =C+C+C+…= 2 n - 1 . 7.概率的计算公式 (1)古典概型的概率计算公式 P(A)=. (2)几何概型的概率计算公式 P(A)=. (3)互斥事件的概率计算公式 P(A∪B)= P ( A ) + P ( B ) . (4)对立事件的概率计算公式 P()=1- P ( A ) . (5)条件概率公式 P(B|A)=. 8.统计中四个数据特征 (1)众数: ①在样本数据中,出现次数最多的那个数据. ②频率分布直方图中,众数是最高矩形的底边中点的横坐标. (2)中位数:在样本数据中,将数据按从小到大(或从大到小)的顺序排列,位于中间的那个数 据.如果数据的个数为偶数,就取中间两个数据的平均数作为中位数. (3)平均数:样本数据的算术平均数, 即=(x+x+…+x). 1 2 n (4)方差与标准差:反应样本数据的分散程度. 方差:s2=[(x-)2+(x-)2+…+(x-)2]. 1 2 n 标准差: s=. 9.离散型随机变量 (1)离散型随机变量的分布列的两个性质 ①p≥0(i=1,2,…,n);②p+p+…+p=1. i 1 2 n (2)均值公式 E(X)=xp + xp + … + xp + … + xp 1 1 2 2 i i n n=p. i i (3)均值的性质 ①E(aX+b)= aE ( X ) + b ; ②若X~B(n,p),则E(X)=np; ③若X服从两点分布,则E(X)=p. (4)方差公式 D(X)=(x-E(X))2p,标准差为. i i (5)方差的性质 ①D(aX+b)= a 2 D ( X ) ; ②若X~B(n,p),则D(X)= np (1 - p ) ; ③若X服从两点分布,则D(X)= p (1 - p ) . (6)独立事件同时发生的概率计算公式 P(AB)= P ( A ) P ( B ) . (7)独立重复试验的概率计算公式 P(X=k)= C p k (1 - p ) n - k , k = 0,1,2 , … , n . 10.线性回归模型 (1)线性回归方程y=bx+a一定过样本点的中心(,), 其中 (2)相关系数r具有如下性质: ①|r|≤1; ②|r|越接近于1,x,y的线性相关程度越强; ③|r|越接近于0,x,y的线性相关程度越弱 . 11.独立性检验 利用随机变量K2=(n=a+b+c+d)来判断“两个分类变量有关系”的方法称为独立性检验. 如果K2的观测值k越大,说明“两个分类变量有关系”的可能性越大. 12.正态分布 如果随机变量X服从正态分布,则记为X~N(μ,σ2). 满足正态分布的三个基本概率的值是 ①P(μ-σ
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  1. CONNECT:[ UseTime:0.000833s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001283s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000634s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000782s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001223s ]
  6. SELECT * FROM `set` [ RunTime:0.000475s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001496s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369045 LIMIT 1 [ RunTime:0.000960s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369045 [ RunTime:0.002203s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086420 WHERE `id` = 369045 [ RunTime:0.001128s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369045 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001041s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369045 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006138s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369045 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010412s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369045 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018952s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369045 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020988s ]
0.218379s