Variance calculation formula

1 / n [(x1-x pull) & sup2; + (x2-x pull) & sup2; +...] +(xn pull) & sup2;], where xn pull is x1, X2 The average of XN

RELATED INFORMATIONS

1. Can you tell me how to do if the integrand of double integral has absolute value The integrand domain is a double integral of the absolute value of the sum of X + y bounded by F (x) = x + 2, f (x) = X-2 and y = 2 / X
2. How to calculate 0.27 * 99 + 0.27
3. Find the volume of the solid surrounded by two orthogonal cylindrical surfaces whose radii are equal to R The first part of the solution to this problem is to set the equations of two cylindrical surfaces as x ^ 2 + y ^ 2 = R ^ 2 and x ^ 2 + Z ^ 2 = r.. Why?
4. The length of the chord of the line x-y-5 = 0 cut by the circle x2 + y2-4x + 4Y + 6 = 0 is___ ．
5. It is known that P (x, y) is a circle x ^ 2 + y ^ 2-6x-4y + 12 = 0 Then x ^ 2 + y ^ 2 value range The answer is 14 + or 13 under - 2 radical
6. If the inequality MX ＞ 2, multiply both sides by 1m at the same time, we can get x ＜ 2m, and find the value range of M
7. In the sequence an, A1 = 1, and the point [a (n), a (n-1)] (n belongs to N +) is on the image of function f (x) = x + 2 (1) The general formula for finding a (n) (2) Take 3.4.6.. 2 Λ n + 1 power + 2.. terms from the sequence a (n) to form a new sequence B (n). Try to find the general term formula BN of B (n), the first n terms and Sn
8. It is known that the joint probability density function of two-dimensional random variables (x, y) is f (x, y) = 2E ^ (- 2x-y), x > 0, Y > 0; f (x, y) = 0 (others) -------------------------------------------------------------------------------------------------- It is known that the joint probability density function of two-dimensional random variables (x, y) is F (x, y) = 2E ^ (- 2x-y), x > 0, Y > 0; f (x, y) = 0 (others) Find the probability of (x, y) falling in the region D: x > = 0, Y > = 0 and X + Y > = 1
9. It is known that the function f (x) is an even function defined on R. when x ≥ 0, f (x) = x2-4x. (1) find the value of F (- 1); (2) find the analytic expression of F (x); (3) find the minimum value of F (x) on [T, t + 1] (T > 0)
10. In the Geometer's Sketchpad, how to make a circle move on a straight line
11. Find the special solution of dy / DX = x + XY ^ / y + YX ^ satisfying the initial condition y (x = 0) = 2
12. Urgent 50 by 0.13 by 0.2 simple algorithm!
13. If the focus of the parabola is (2,2), and the Quasilinear equation is x + Y-1 = 0, the parabola equation is solved
14. Let the coordinates of a (x, y) satisfy the square of (Y-1) + | x + 7 | = 0, then point a is in the
15. How many microns is a millimeter? How many nanometers is a micron?
16. The system of linear equations x + 2Y = 4K with respect to X and Y is known The solution of 2x + y = 2K + 1 satisfies - 1
17. If the area of the triangle formed by the function y equals two-thirds of minus x plus B and the coordinate axis is 12, then B =?
18. If the length ratio of the three edges of a cuboid passing through a vertex is 1:2:3 and the diagonal length is 214, the cuboid volume is______ ．
19. What is the area of the figure enclosed by the curve y = 2x2, the straight line y = - 4x-2, and the straight line y = 1 The area of the figure enclosed by the curve y = 2x2, the straight line y = - 4x-2 and the straight line x = 1 is
20. 2, - 3, - 4, 5 how to calculate 24 o'clock