x+4=9
x+4-`square`=9-`square`
x=`square`

Mean of x= 53 Mean of y = 28 Regression coefficient of y on x = - 1.2 Regression coefficient of x on y= - 0.3 When y = 25 x-square=square(25- square) :. x = square

In the figure seg PQ|| seg DE, A(DeltaPQF)=20 units PF=2DP ,then find A(square DPQE) by completing the following activity: Activity: A(DeltaPQF)=20 sq units, PF=2DP . Let us assume DP=x :.PF=2x DF=DE+square=square+square=3x In DeltaFDE and DeltaFPQ . /_FDE~=/_square ..........(Corresponding angles) /_FED~=/_square .....(Corresponding angles) :.DeltaFDE~DeltaFPQ .....(AA test) :.(A(DeltaFDE))/(A(DeltaFPQ))=(square)/(square)=((3x)^(2))/((2x)^(2))=9/4 A(DeltaFDE)=9/4A(DeltaFPQ)=9/4xxsquare=square A(squareDPQE)=A(DeltaFDE)-A(DeltaFPQ) =square-square =square

b_(xy) = (square)/(square) b_(yx) = (square)/(square) :. Regression equation of x on y is square :. Regression equation of y on x is square

The regression equation of x on y is 40x-18y = 214… (i) The regression equation of y on x is 8x -10y +66 =0….. (ii) Solving equations i and ii, barx=square bary=square :. b_(yx) = (square)/(square) :. b_(xy) = (square)/(square) :. r = square

Mean of x= 53 Mean of y = 28 Regression coefficient of y on x = - 1.2 Regression coefficient of x on y= - 0.3 When x = 50 , y-square=square(50- square) :. y = square

Complete the following: 2x+y=8 x: 0, square , 3 y: square , 4, 2 (x,y): square , square , (3,2) x-y=1 x: square , 2, square y: -1, square , 4 (x,y): square , square , square

Mean of x= 25 Mean of y =20 sigma_x = 4 sigma_y=3 r = 0.5 b_(yx) = square b_(xy)= square When x = 10 y-square=square(10 - square) :. y = square

Given : n(A)=5,(B)=6, n(A uuB)=9 for calculation of n(A nnB) . Complete the activity. n(A nnB)=n(A) +n(B)-square =5+square -9 =square -9 n (A nnB)=square

The regression equation of y on x is 2x-5y +60 =0. Mean of x = 18 :. bary=square sigma_x:sigma_y=3:2 :. b_(yx)= (square)/(square) :. r = square

Complete the following activity to solve simultaneous equations : 4x+ 3y = 18 " "...(1) 5x - 3y = 9 " " ...(2) Adding equations (1) and (2) , +{:(4x+3y=18" ...(1)"),(5x-3y=9" ...(2)"),(bar(squarex" "=square)):} :. X = (square)/(square ) " " :. X = square Substituting x = 3 in equation (1) , 4 xx square + 3y = 18 " " :. 3y = 18 - square " " :. 3y = square :. y = 2 (x,y ) = (square, square ) is the solution