URGENT!!!!!!!!!!!!!!!

can u plz solve question no. 16 of tr jain and vk ohri of correlation chapter with shortcut method plz. i want to find my mistake plz..

 
Age Group Mid Value
(X)
% of Regular Players
(Y)
dX=X-A=X-37.5 dY=Y-B=Y-28 (dX)(dY) (dX)2 (dY)2
20-25
25-30
30-35
35-40
40-45
45-50
22.5
27.5
32.5
37.5
42.5
47.5
40
35
28
20
15
5
–15
–10
–5
0
5
10
12
7
0
–8
–13
–23
–180
–70
0
0
–65
–230
225
100
25
0
25
100
144
49
0
64
169
529
      dX = –15 dY = –25 ∑(dX)(dY) = – 545 ∑(dX)2 = 475 ∑(dY)2 = 955

r=dXdY-dX×dYNdX2 -dX2N×dY2 -dY2Nor, r=-545--15×-256475--1526×955--2526=-607.5475-37.5×955-104.16or, r=--607.5437.5 × 850.84=--607.5372242.5=-607.5610.11Hence, r=-0.996
 

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