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计算平均数时,由于备个数据的出现次数或重要程度不同,需要给备数据分配权重,利用加权平均数公式计算,加权平均数的公式:=(x_1f_1+x_2f_2+…+x_nf_n)/(f_1+f_2+…+f_n),其中f_i表示数据x_i的权重.1.比例例1超市决定招聘广告策划人员一名,某应聘者三项素质测试的成绩如下表:
When calculating the average, because of the number of occurrences or the degree of importance of the prepared data, we need to allocate weights to the prepared data and calculate the weighted average using the formula of weighted average: = (x_1f_1 + x_2f_2 + ... + x_nf_n) / (f_1 + f_2 + ... + f_n), where f_i represents the weight of the data x_i.1.Example 1 The supermarket decides to recruit one advertising planner and the result of three qualifying tests of a candidate is as follows: