What is the formula of standard deviation, covariance and correlation coefficient

RELATED INFORMATIONS

• 1. How to calculate the area of parabola and straight line with definite integral The parabola y = the square of X and the straight line y = 2x form the figure and area from 0 to 2
• 2. Primary school fifth grade mathematics exercise book (1) 45 answers
• 3. Hyperbola 16x ^ 2-9y ^ 2 = 144, the left and right focal points are F1F2 respectively, the point P is on the hyperbola and ∠ f1pf2 = 60 ° to calculate the area of △ f1pf2
• 4. What is the third grade of primary school
• 5. Find the equation of the circle whose center C is on the straight line x + 2Y + 4 = 0 and passes through two points a (- 1,1), B (1, - 1)
• 6. (1) 14700-14700 △ 28 + 825; & nbsp; & nbsp; & nbsp; & nbsp; (2) (3400 + 2856 △ 84) △ 34
• 7. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
• 8. Given the image of quadratic function y = AX2 + BX + C, we try to explain the symmetry axis of this function image when x = 2 through a (0, a) B (1, - 2A) It is known that the image of quadratic function y = AX2 + BX + C passes through a (0, a) B (1, - 2A) (1) Try to explain the symmetry axis of this function image when x = 2; (2) Based on the available information, can you find the analytic expression of quadratic function in the title? (1) Ask already know
• 9. Third grade math problem with 24 side length is 1 cm small square put together into a rectangle, this rectangle circumference is how many centimeters?
• 10. How to find the instantaneous velocity of the first point How to find the instantaneous speed of the first point in a certain period after the learning clock in grade one of senior high school?
• 11. When we ask the value of M, the equation x & # 178; - 2mx + 2m + 3 = 0 has two negative numbers
• 12. The difference of negative power with or without brackets
• 13. Given the solution of the quadratic equation AX ^ 2 + BX + C = 0 about x? You have already answered the answer to this question, but can you tell us the detailed process, thank you. We know that the two univariate quadratic equations ax ^ 2 + BX + C = 0 about X are α and β, and the two equations x ^ 2 + (α + 1) x + β ^ 2 = 0 and x ^ 2 + (β + 1) x + α ^ 2 = 0 about X have a unique common root, so we can find the relationship of a, B and C The answer might be - B / a = - 2 / 5, C / a = - 3 / 25
• 14. Why is 1 divided by 10 equal to 0
• 15. It is known that in the hyperbola X & # 178 / 9-y & # 178 / 16 = 1, a and B are the left and right vertices of the hyperbola, and the line L passing through point a is perpendicular to the X axis, Next: find the trajectory equation of the right vertex of the hyperbola and the point with the same distance from the straight line L For the benefit of both sides, the copy has been proofread,
• 16. Do you want to write the multiplication formula of the whole ten times one digit? () × () = () × () = () x () = 120
• 17. As shown in the figure: it is known that the midpoint a (a, b) point B (a, 0) in the plane rectangular coordinate system satisfies | 2a-b | + (B-4) 2 = 0 (1) (2) given point C (0, b), point P starts from point B and moves at a speed of 1 unit per second in the negative direction of x-axis. At the same time, point Q starts from point C and moves at a speed of 2 units per second in the negative direction of y-axis. At a certain time, as shown in the figure, and s yin = 12s quadrilateral ocab, the moving time of point P is calculated? (3) Under the condition of (2), AQ intersects the x-axis at m, makes the angle bisector of ∠ ACO and ∠ AMB intersects at point n, and judges whether ∠ n - ∠ APB - ∠ PAQ ∠ AQC is a fixed value. If it is a fixed value, calculate the value; if not, explain the reason
• 18. Does the abacus mental arithmetic in grade one of primary school only include addition and subtraction
• 19. Finding a monotone increasing interval of F (x) = SiNx ^ 2
• 20. Limit calculation of advanced mathematics lim tanx-sinx / x^3 x→0