高中数学：22(总体分布估计)课件苏教版必修3 课件.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,总体分布,抽样序号,n=25,n=250,n=2500,m,m/n,m,m/n,m,m/n,1,1,0.04,12,0.048,157,0.0628,2,4,0.16,14,0.056,152,0.0608,3,0,0.00,17,0.068,157,0.0628,4,0,0.00,11,0.044,136,0.0544,5,1,0.04,22,0.088,152,0.0608,6,1,0.04,9,0.036,135,0.0540,7,2,0.08,15,0.060,143,0.0572,8,0,0.00,14,0.056,160,0.0640,9,1,0.04,21,0.084,149,0.0596,10,1,0.04,8,0.032,153,0.0612,试验结果,概率,次品,0.06,正品,0.94,试验结果,频数,频率,国徽向上,36124,0.5011,国徽向下,35964,0.4989,样本（容量72088）频率分布,试验结果,概率,国徽向上,0.5,国徽向下,0.5,总体分布,次品,正品,试验结果,0.9388,0.0612,频率,从规定尺寸为25.40,mm,的一堆产品中任取100件，测得它们的实际尺寸如下：,25.39 25.36 25.34 25.42 25.45 25.38 25.39 25.42,25.47 25.35 25.41 25.43 25.44 25.48 25.45 25.43,25.46 25.40 25.51 25.45 25.40 25.39 25.41 25.36,25.38 25.31 25.56 25.43 25.40 25.38 25.37 25.44,25.33 25.46 25.40 25.49 25.34 25.42 25.50 25.37,25.35 25.32 25.45 25.40 25.27 25.43 25.54 25.39,25.45 25.43 25.40 25.43 25.44 25.41 25.53 25.37,25.38 25.24 25.44 25.40 25.36 25.42 25.39 25.46,25.38 25.35 25.31 25.34 25.40 25.36 25.41 25.32,25.38 25.42 25.40 25.33 25.37 25.41 25.49 25.35,25.47 25.34 25.30 25.39 25.36 25.46 25.29 25.40,25.37 25.33 25.40 25.35 25.41 25.37 25.47 25.39,25.42 25.47 25.38 25.39,请问：（1）这个问题的“总体”是什么？,（2）如何处理这些数据？即如何估计这个问,题的“总体分布”？,分组,个数累计,频数,频率,25.235,25.265),一,1,0.01,25.265,25.295),2,0.03,25.295,25.325),正,5,0.05,25.325,25.355),正正,12,0.12,25.355,25.385),正正正下,18,0.18,25.385,25.415),正正正正正,25,0.25,25.415,25.445),正正正一,16,0.16,25.445,25.475),正正下,13,0.13,25.475,25.505),4,0.04,25.505,25.535),丅,2,0.02,25.535,25.565),丅,2,0.02,合计,100,1.00,第六步，列出频率分布表。,第六步，列出频率分布表。,分组,个数累计,频数,频率,25.235,25.265),一,1,0.01,25.265,25.295),2,0.03,25.295,25.325),正,5,0.05,25.325,25.355),正正,12,0.12,25.355,25.385),正正正下,18,0.18,25.385,25.415),正正正正正,25,0.25,25.415,25.445),正正正一,16,0.16,25.445,25.475),正正下,13,0.13,25.475,25.505),4,0.04,25.505,25.535),丅,2,0.02,25.535,25.565),丅,2,0.02,合计,100,1.00,正,25.235 25.295 25.355 25.415 25.475 25.535,产品尺寸(,mm）,频率分布直方图,25.235 25.295 25.355 25.415 25.475 25.535,产品尺寸(,mm）,总体密度曲线,为了了解一大片经济树林的生长情况，随机测量其中的100株的底部周长，得到如下数据表（长度单位：,cm）,135 98 102 110 99 121 110 96 100 103,125 97 117 113 110 92 102 109 104 112,109 124 87 131 97 102 123 104,104,128,105 123 111 103 105 92 114 108 104 102,129 126 97 100 115 111 106 117 104 109,111 89 110 121 80 120 121 104 108 118,129 99 90 99 121 123 107 111 91 100,99 101 116 97 102 108 101 95 107 101,102 108 117 99 118 106 119 97 126 108,119 98 121 101 113 102 103 104 108,（1）,编制样本频率分布表；,（2）,绘制样本频率分布直方图；,（3）根据样本的频率分布，估计该片经济树林中底部周长小于100,cm,的树木约占多少，不小于120,cm,的树木约占多少。,