Test and analysis: (1) The average formula is; (2) List 10 results of two of the five papers in Class A. If there are scores between at most seven results, the probability is.

Question analysis: (1) According to the meaning of the question? 2 points

4 points for the solution

(2) The total scores of two of the five papers in Class A are: (88,89), (88,90), (88,91), (88,92), (89,90),

(89,965,438+0), (89,92), (90,965,438+0), (90,92), (965,438+0,92) 6 points.

*** 10 7 points

All the results with at least one score in the middle are: (88,965,438+0), (88,92), (89,965,438+0), (89,92), (90,965,438+0), (90,92).

***7 kinds? 10 point

So what is the probability that at most one sample will score between the two? 1 1 min

A: What is the probability that at most one sample will score between? 12 point