The variance s square of a set of data is 10 / 1 [(x1-2) square + (x2-2) square +...] +The average of (x10-2) square] is——

RELATED INFORMATIONS

• 1. If the sum of squares of 10 positive numbers is 370 and the variance is 33, then the average is () A. 1B. 2C. 3D. 4
• 2. Variance and mean, and sum of squares There are 40 data. The sum of squares is 56. The root of the average is 2. What is the variance? What are the data
• 3. If there are 10 data, their sum of squares is 1723 and the average is 13, then their variance is 0
• 4. We know that the average of the sum of squares of a group of data is 228, and the average is 15. We can find the variance of this group of data
• 5. The sum of squares of 50 data is 800, and the average is 3. Find the standard deviation of the 50 data
• 6. For a group of data x1, X2, X3, X4 composed of positive integers, the average and median are 2, and the standard deviation is 1, then this group of data is___ (from small to large)
• 7. For a group of data x1, X2, X3, X4 composed of positive integers, the average and median are 2, and the standard deviation is 1, then this group of data is___ (from small to large)
• 8. Variance formula: the average of samples 9.8, 9.9, x, 10, 10.2 is 10, and the variance is calculated
• 9. The average of known samples 9.8, 9.9, x, 10, 10.2 is 10, and the variance is calculated
• 10. It is proved that the sum of squares of the diagonals of a parallelogram is equal to the sum of squares of its sides
• 11. The variance of a group of data S2 = [(x1-2) 2 + (x2-2) 2 +...] +(x10-2) 2], then the average of this set of data is_______ .
• 12. The variance of data x1, X2, and X10 is 2 (x1-3) square + (x2-3) square +,,, + (x10-3) square = 120 to find the average of X
• 13. It is known that the average and variance of a group of data x1, X2... And X10 are 3 and 2, respectively. Then the average and variance of another group of data 2x1-1, 2x2-1... And 2x10-1 are respectively 3 and 2
• 14. Given a set of data x1, X2 The average of x1, X2, X3 is a, x4, X5, X6 , the average of X10 is B, then the average of this set of data is () A. a+b2B. 3a+7a10C. 7a+3b10D. a+b10
• 15. Given a set of data x1, X2, X3, the variance of X10 is 2, and (x1-3) ^ 2 + (x2-3) ^ 2 + (x3-3) ^ 2 +... + (x10-3) ^ 2 = 120, find the average X
• 16. If the average number of one set of data x1, X2, and X10 is 5, then the average number of another set of data X1 + 2, X2 + 2, and X10 + 2 is 5
• 17. Given a set of data x1, X2 The variance of x 10 is s ^ 2 = 6, find another set of data 1 / 3x1,1 / 3x2 What is the variance of 1 / 3x10? That's x, subscript 1, and so on
• 18. A set of data x1, X2 The average of XN is 90, the variance is 13.5, then 3x1-80, 3x2-80 The average of 3xn-80 is______ The variance is______ ．
• 19. Data x1, X2 If the average of XN is 5 and the variance is 2, then 3XL + 2, 3x2 + 2 The average of 3XN + 2 is______ The variance is______ ．
• 20. Known samples x1, X2 If the variance of XN is 2, then the sample is 3x1 + 2, 3x2 + 2 The variance of 3XN + 2 is______ ．