Take 4 / 1,4 / 1,4 / 1,4 / 1 as the weight to calculate the average number of this group of data, and 0.1,0.2,0.3,0.4 as the weight to calculate the average number of this group of data This set of data is 21, 32, 43, 54

The first, since the weighted sample, is the arithmetic mean
（21+32+43+54）/4=37.5
The second is:
21*0.1+32*0.2+43*0.3+54*0.4=43

RELATED INFORMATIONS

1. The average of a set of data 2,0, negative 2,1,3 is
2. 1, 2, 4, 8, 16, what is the number of 2013? What if it's the nth number? Is it the N-1 power of 2?
3. The sum of three numbers is 7 / 12. If one number is 1 / 10 and the other is 1 / 4, find the third number One minute!!! Hurry, hurry, hurry, hurry, hurry, hurry!!!!!!!!!!!!!!!!!!!!!!!!! one
4. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
5. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
6. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
7. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
8. How many integers from 1 to 2010 are not divisible by 2 or 3?
9. The first line: 1, the second line: 2, 3, the third line: 4, 5, 6, the fourth line: 7, 8, 9, 10. According to the law, what's the last number in line 10000? The teacher asked us: the first line: 1, the second line: 2, 3, the third line: 4, 5, 6, the fourth line: 7, 8, 9, 10. According to the law, what is the last number in the 10000 line?
10. The numbers of 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5, - 1 / 6 are arranged as follows according to certain rules: the first line is 1, the second line is - 1 / 2 1 / 3, the third line is - 1 / 4 1 / 5 - 1/ 0 - 14 days and 23 hours to the end of the problem The numbers 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5, - 1 / 6 are arranged as follows according to certain rules, First line 1 Second line - 1 / 2 1 / 3 The third line - 1 / 4 1 / 5 - 1 / 6 The fourth line 1 / 7 - 1 / 8 1 / 9 - 1 / 10 The fifth line 1 / 11 - 1 / 12 1 / 12 - 1 / 14 1 / 15 ………… ……………… ………… So, can you write seven numbers from left to right on line 199? Be more specific. I'll hand it in tomorrow
11. There are 10 data in a group, and the difference between each data and their average is - 2,4,4,5, - 1, - 2,0,2,3, - 5, then the variance of this group of data is - A .0 B.104 C.10.4 D.3.2
12. The average and variance of data 0.1, 0.2, 0.3, 0.4 and 0.5 are calculated by two methods
13. The median is 3.5, the average is 4.5, ask 4.0 2.3 6.2 2.8 () 8.7 what are the numbers in brackets
14. We know that a group of integers from big to small are: 10, 10, x, 8. Their median is equal to the average. Find the value of X and the median of this group of data
15. There are 9 data in a group of data, which are 3, 2.8, 6, 4.5, 2.8, 3.1, 1, 1.9, 3, X respectively, so as to know that the mode of this group of data is 2.8, And if it is unique, then x is equal to
16. In the data set of 1.5, 2.8, 3.2, 3.4, 2.9, 3, 3.2, the median is? Mode is?
17. Is there mode in data 2.3.4.5.6.7.8.9? Why
18. In the data of 1.5, 2.8, 3.2, 3.4, 2., 9, 3, 3.2, the median is () and the mode is () At 1.5, 2.8, 3.2, 3.4, 2., 9, 3, 3.2 In this set of data, the median is () and the mode is ()
19. There is a group of data as follows: 30.24.36.18.24.24 the median of this group of data is (), and the mode is ()
20. There is a group of numbers: 3, 5, 6, 8, 9, 22, 24. The average of these numbers is______ What's the median______ As can be seen, the median is not affected______ Or______ The influence of data is sometimes used to represent the influence of all data______ More appropriate