In another shooting test, the average number of rings of a, B, C and D is the same, but the variance is 8.7, 6.5, 9.1 and 7.7 respectively Q: what is the most stable shooting result among the four A. A b b c c c d

The variance is the smallest, the result is the most stable, choose B

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1. If the average number of time spent on the way to work is 10 and the variance is 2, then the value of X-Y is 0 The process should be detailed`
2. The time (minutes) taken by a person on his way to work five times are x, y, 14, 12 and 13 respectively. Given that the average of this set of data is 12 and the variance is 2, then the value of | X-Y | is 0
3. The time (unit: minutes) that someone spends on the way to work five times are x, y, 10, 11 and 9 respectively. Given that the average of this set of data is 10 and the variance is 2, then the value of | X-Y | is () A. 1B. 2C. 3D. 4
4. The time (unit: minutes) that someone spends on the way to work five times are x, y, 10, 11 and 9 respectively. Given that the average of this set of data is 10 and the variance is 2, then the value of | X-Y | is () A. 1B. 2C. 3D. 4
5. The time Xiao Ming spent on his way to school five times is x y 10 11 9. Given that the average of this group of data is 10 minutes and the variance is 2, what is the absolute value of X-Y? A (1) B (2) C (3) d (4), please write down the whole process,
6. If the average of data 8, 9, 7, 8, x, 4 is 7, then the variance of this set of data is______ ．
7. Given a group of data 9,10,11, x, y, the average is 10, the variance is 2, find this group of data
8. A group of data is x y 9 10 11, the average of this group of data is 10, then the minimum variance is 0
9. It is known that the average and variance of the first 20 data are 60 and 20 respectively, and the average and variance of the last 20 data are 80 and 40 respectively
10. If the average of sample data 3, 6, a, 4 and 2 is 5, then the variance of this sample is () A. 8B. 5C. 22D. 3
11. In a shooting competition, the result of a country's 10 times is 92 rings, and that of B country's 7 times is 9,10,9,10,10,9,8 respectively. If B country's athlete wants to surpass that of a country, how many rings should he hit in the last 3 times?
12. A certain organic compound A is composed of C, h and O. under certain conditions, the conversion relationship among a, B, C, D and E is as follows: it is known that the vapor density of C is 22 times higher than that of hydrogen under the same conditions, and silver mirror reaction can occur. (1) the name of the functional group in substance D is______ The structure formula of substance e is______ (2) write out the chemical equation to realize the following transformation: ① a → B______ ，②A+O 2 →C______ ③ The reaction equation of C with silver ammonia solution______ ．
13. With the four numbers of 0, 5, 8 and 7, we can form () different four digit numbers? (1) 10 (2) 18 (3) 11 (4) 9
14. 0-1+2-3+4-5+6-7+8-9+10-.-99+100 0.1+0.3+0.5+0.7+0.9+0.11+0.13+.+0.97+0.99
15. 1+2+3+4+5+6+7+8+9+0+10.23＝
16. What is 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9-10
17. 1+1+2+3+4+5+6+7+8+9+0+10=?
18. The mean, median and mode all reflect a set of data______ The statistics of the model
19. How to find the average, median and mode of a group of data?
20. Average is a characteristic number of a group of data (). Median can be used to represent (). Mode can be used to represent a group of data The last one is not finished