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6.1统计重点难点易混易错点剖析复习重点:统计在近5年河南中考中每年必考,且常设置2道题,分值为9~12分,常考点有:①调查方式.②统计图表的分析.③平均数、众数、中位数的应用.④极差、方差的应用.⑤根据平均数与方差进行合理的判断.⑥统计图表与平均数、众数、中位数的综合运用问题.复习难点:计算一组数据的加权平均数。计算样本的方差。运用方差估计几组数据的离散程度。用样本估计总体的思想方法的应用.
6.1 Statistical key points are easy to analyze and analyze error points. Review point: Statistics must be taken each year in the last five years in the Henan middle school exam, and often set two questions, with scores of 9 to 12 points, the regular test sites are: 1 survey methods. 2 statistics Analysis of Charts. 3 Mean, Mode, and Median Applications. 4 Range, Variance Applications. 5 Reasonable judgments based on mean and variance. 6 Statistical charts and averages, modes, medians Comprehensive application of problems. Review difficult points: Calculate the weighted average of a set of data. Calculate the variance of the sample. Use variance to estimate the degree of dispersion of several sets of data. Use the sample to estimate the application of the overall thought method.