38. (a) The daily wages of 160 workers in a building project are given below:- Wages in Rs. 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70 70 - 80 No. of Workers 12 20 30 38 24 16 12 8 Using a graph paper, draw an Ogive for the above distribution. Use your Ogive to estimate:- (i) the median wage of the workers   39. (ii) the upper quartile wage of the workers   40. (iii) the lower quartile wage of the workers   41. (iv) the percentage of workers who earn more than Rs. 45 a day. (Type in the answers separated by commas. Leave no spaces around the commas.)   42. (b) In the figure given above, PB and QA are perpendiculars to the line segment AB. If PO = 6 cm, QO = 9 cm and the area of ΔPOB = 120 cm2, find the area of triangle ΔQOA.