Following data are given for marks in subject A and B in a certain examination :
SUBJECT A ( MEAN MARKS 36, STANDARD DEVIATION 11 )
SUBJECT B ( MEAN MARKS 85, STANDARD DEVIATION 8 )
Coefficient of correlation between A and B = ±0.66
i) Determine the two equations of regression
ii) Calculate the expected marks in A corresponding to 75 marks obtained in B.