Generally speaking, it is 1, 7, 8, 9, 2, 1, 3. There are seven numbers, and these seven are the numbers of data.
Mode, a statistical term, is a numerical value with obvious concentration of trend points in statistical distribution, which represents the approximate level of data (mode may not exist or there may be more than one). Revision definition: it is the value with the highest frequency in a set of data, which is called the mode. Sometimes there are several patterns in a set of numbers. Represented by M. rational knowledge: in short, it is the number with the largest proportion in a set of data.
Median, a statistical term, refers to arranging the variable values in a statistical population in order of size to form a sequence. The variable value in the middle of the variable sequence is called the median, which is expressed by me. When the number of terms n of the variable value is odd, the variable value in the middle position is median; When n is an even number, the median is the average value of the two variables in the middle. (Note: Unlike the mode, the median is not necessarily in this set of data. )
The average value refers to the sum of all data in a set of data divided by the number of data. The average value is a quantity representing the trend of a set of data sets and an index reflecting the trend of data sets. The key to solve the problem of average application is to determine the "total amount" and the total number of copies corresponding to the total amount. In statistical work, mean and standard deviation are the two most important measures to describe the trend and deviation of data sets.