1. (a) Draw a histogram and hence estimate the mode for the following frequency distribution:- Class 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 Frequency 2 8 10 5 4 3   2. (b) A man standing on the bank of a river observes that the angle of elevation of a tree on the opposite bank is 60°. When he moves 50 m away from the bank. He finds the angle of elevation to be 30°. Calculate:- (i) the width of the river and