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A sample with 40 data is statistically divided into 6 groups. If the frequency of a group is 0.15, then the frequency of the group is______ ．
15 = 6, so the answer is 6
50 data were divided into three groups. The sum of the frequencies of the first group and the third group was 0.7, then the frequency of the second group was 0.7______ ．
According to the nature of frequency, the frequency of the second group is 0.3, then the frequency of the second group is 50 × 0.3 = 15
Concepts of population, individual and sample, sample size, frequency and frequency in Statistics
Statistical Totality: the totality of the things to be studied determined according to a certain purpose. It is a totality composed of many individual things that exist objectively and have some common properties. Homogeneity is the basic standard for determining statistical totality, which is determined according to the research purpose of statistics
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