1. (a) Using the data given below construct the cumulative frequency table and draw the ogive. From the ogive determine the median. Mark 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70 70 - 80 No. of Students 3 8 12 14 10 6 5 2   2. (b) Construct an isosceles triangle ABC such that AB = 6 cm, BC = AC = 4 cm. Bisect ∠C internally and mark a point P on this bisector such that CP = 5 cm. Find the points Q and R which are 5 cm from P and also 5 cm from the line AB.