Chapter 4 "Frequency and Frequency" ppt review of the eighth edition of Xiangjiao 1. In statistics, we call the number of occurrences of each test object _______, and the ratio of the number of occurrences of each object to the total number is _____. 2. The sum of the frequency of each object is equal to _________, and the sum of each frequency is equal to ————. 3. It is known that in a sample, 50 pieces of data fall into 5 groups, and the number of the first, second, third, and fifth data are 2, 8, 15, 5, respectively, and the frequency of the fourth group is- , The frequency is ————.
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