Variance formula: the average of samples 9.8, 9.9, x, 10, 10.2 is 10, and the variance is calculated

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• 1. The average of known samples 9.8, 9.9, x, 10, 10.2 is 10, and the variance is calculated
• 2. It is proved that the sum of squares of the diagonals of a parallelogram is equal to the sum of squares of its sides
• 3. Prove with complex number: the sum of squares of parallelogram diagonal is equal to the sum of squares of four sides
• 4. Prove with vector method: the bisection sum of two diagonals of parallelogram is equal to twice of the square sum of two adjacent sides If the title, the best process Thank you! On the first floor Is the vector method that simple? ==|||I feel the process is so short No Of course, I think it's better to be short But the teacher won't let me But forget it Thank you for your quick answer ==|||I hate winter vacation homework Ah, ah
• 5. The proof that the sum of squares of diagonals of parallelogram is equal to the sum of squares of four sides RT I hope to be more detailed. If some trigonometric functions are involved, I also hope to explain them
• 6. Please give the proof of the relation theorem between the diagonal and the side of a parallelogram (the sum of the squares of the two diagonals of a parallelogram is equal to the sum of the squares of its four sides)
• 7. Proof: the square sum of two diagonals of a parallelogram is equal to the square sum of four sides
• 8. Verification: the sum of squares of two diagonals of a parallelogram is equal to the sum of squares of four sides
• 9. Proof: the square sum of two diagonals of a parallelogram is equal to the square sum of four sides
• 10. Prove that the sum of squares of four sides of a parallelogram is equal to the sum of squares of diagonals
• 11. 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)
• 12. 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)
• 13. The sum of squares of 50 data is 800, and the average is 3. Find the standard deviation of the 50 data
• 14. 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
• 15. If there are 10 data, their sum of squares is 1723 and the average is 13, then their variance is 0
• 16. 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
• 17. 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
• 18. 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——
• 19. 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_______ .
• 20. 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