Ndi Family income and its percentage spent on food in the case of
hundred families gave the following bivariate frequencies
distribution
Food expenditure
Family income (Rs.)
(in %)
200-300 300-400 400-500 500-600 600-700
10-15
3
7
15-20
4
9
4
20-25
7
6
12
5
25-30
3
10
19
8
Obtain the equations of the two lines of regression. Also find the
correlation between food expenditure and family income.