A departmental store gives in-service training to salesmen followed by a test.It is experienced that the performance regarding sales of any sales man is linearly related to the scores secured by him. The following data give test scores and sales by nine salesmen during fixed period.

Test score(X)162228242925162324

Sales ('00$)(Y) 354257405451344745

(i)Find the regression line of Y on x

(ii)Predict the sales from a salesman with test score of 30.

(iii) Find the correlation coefficient and comment on your result.