basic concept
Also known as the times. In a group of measured values arranged in order of size, when grouped at a certain group distance, the number of measured values appearing in each group is the number of data falling in each category (grouping). If there is a set of measured data, the total data is N= 148, the minimum measured value xmin=0.03, and the maximum measured value xmax=3 1.67. According to the interval △x=3.000, the data of 148 are divided into 1 1 groups, and another example is given. In 3. 149324, the frequency of "9" is 3, and the frequency of "9" is 3/. Generally, we call the number of data falling in different groups the frequency of the group, and the ratio of frequency to the total number is the frequency. Frequency, also known as "times", groups the total data according to some standard and calculates the number of individuals in each group. Frequency is the ratio of the frequency of each group to the total data. In the variable distribution sequence, frequency indicates the function degree of the corresponding group flag values. The greater the frequency value, the greater the contribution of this group of flag values to the overall level; On the contrary, the smaller the frequency value, the smaller the contribution of this group of marker values to the overall level. Coin toss experiment: In 10 coin toss, 4 times were heads up. Let's say that the frequency of' heads up' in this 10 experiment is four examples: we often toss coins, and after one hundred times, 40 coins are heads up, so the frequency of tails up is _ _ _ _. Answer, 65433 coins were thrown.