Q2: Suppose that the ratio of data distribution within the standard deviation range near the mean is 68%. Q: What is the probability that the data is less than the average+1 standard deviation? The answer is 1-( 1-68%)/2=84%.
Q24: Answer: The proportion of "user-friendly" or "quick response time" or both is 56%+48%-30%=74%, so the proportion of "user-friendly" or "quick response time" is 1-74%=26%.
Q28: Divide N students into M classrooms. Is it possible to make the number of students in each classroom equal? If (1) holds, assuming that n= 14, then 3n=42, m = 6 or 7, and then back to the original question, put 14 students in seven classrooms, and put two candidates in each classroom (1).
Q35: The infected person is+,and the uninfected person is-. Under what circumstances can this test be proved to be accurate? (1): People who show+are not actually infected. This phenomenon should indicate that the test is not accurate, so choose (2)
I wish LZ good results in the exam, and I wish myself and everyone come on ~ ~