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

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• 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. There are 10 known data x1, X2 The average number of x 10 is 4, and the sum of the squares of these 10 numbers is 200
• 3. What is the average of samples 8,7,6,9,12,8,10,12?
• 4. Why is the sum of squares of the diagonals of a parallelogram equal to the sum of squares of its four sides? I don't know what the cosine theorem is and I didn't learn it!
• 5. For the proof of string theorem: the sum of squares of two diagonals of a parallelogram is equal to the sum of squares of its sides
• 6. The side length of a diamond is 2 cm. Find the square sum of the diagonal length of the diamond
• 7. What is the sum of squares of the first 2006 numbers in the sequence of 1212212212222?
• 8. Sequence and mathematical induction 1. Known sequence a, a (1-A), a (1-A) 2 Is an equal ratio sequence, then the value range of the real number a is________ 2. "Three numbers a, B, C are equal proportion sequence" is the basic of "B2 = AC"________ condition 3. If three numbers x, 2x + 2 and 3x + 3 are in equal proportion sequence, then X=________ 4. In the equal ratio sequence {an}, a1 + A2 + a3 = 6, A4 + A5 + A6 = 48, find the general term formula of the sequence {an} 5. It is known that the sequence {an} is an equal difference sequence, and the sequence {BN} is an equal ratio sequence, and Sn = ean, TN = LG BN, where n belongs to n *. Verification: (1) the sequence {Sn} is an equal ratio sequence, and (2) the sequence {TN} is an equal difference sequence 6. If A4 = 5, a8 = 6, then A2 &; a10=________ ,a6=________ 7. It is known that {an} is an equal ratio sequence, and an ＞ 0, A2 A4 + 2 A3 A5 + A4 A6 = 25. Then the value of A3 + A5 is equal to________ 8. Known A1, A2 If the common ratio Q ≠ 1, then () A. A1 + A8 > A4 + A5 B. a1 + A8 < A4 + A5 C. a1 + A8 = A4 + A5 D. the size relationship between a1 + A8 and A4 + A5 cannot be determined 9. There are three numbers in equal proportion sequence, the product of which is 27, and the sum of squares of which is 91 10. Given that the sum of the first n terms of the sequence {an} is Sn = 3 + 2n, find the general term formula an
• 9. How to prove this inequality by mathematical induction? N ^ 3 < when n is greater than or equal to 6 Please give a complete answer! Brother There is a passage that I didn't understand. How did I get it? (k+1)!-(k+1)^3 >(k+1)k^3-k^3-3k^2-3k-1
• 10. Sequence, mathematical induction, function, inequality F (x) = x - (3 / 2) x & sup2;, A1 ∈ (0,1 / 2), a (n + 1) = f (an), n ∈ n * An
• 11. The average of x1, X2, X is 3, the average of x4, X5,... X10 is 6, then the average of x1, X2,. X10 is? It's urgent
• 12. It is known that the variance of a set of data x1, X2, X10 is 2, and (x1)
• 13. If sample x1, X2 The sample 3x1 + 5, 3x2 + 5 The average and variance of 3XN + 5 are () A. .x、s2B. 3.x+5、s2C. 3.x+5、9s2D. 3.x+5、（3s+5）2
• 14. Known samples x1, X2 If the variance of XN is 5, then samples 3x1 + 2, 3x2 + 2 What is the variance of 3XN + 2?
• 15. 40 minutes = () hours 5 cm = () meters 750 kg = () tons 120 square decimeters = () square meters Answer with marks
• 16. Find the reduction ratio of 6 / 7 square meters to 1.25 square decimeters emergency
• 17. To represent a set by description (2.4.6.8) requires an analysis process,
• 18. The following sets {- 2, - 4, - 6, - 8, - 10} are represented by description
• 19. How can set [2,4,6,8] be represented by description?
• 20. Using description method to represent set M = {(0,3) (3,0) (1,2) (2,1)}