The following table gives the age of husbands and wives at the time of their marriage. Calculate the co-relation coefficient between the ages of husbands and wives :
Ages of wives :-
30-40
40-50
50-60
60-70
Age of Husbands
30-40
20
40-50
50-60
60-70
::
26 •
14
A
--
"-
37
18