In a grouped frequency distribution with classes 2050-2550 (5), 2550-3050 (10), 3050-3550 (k), 3550-4050 (8), 4050-4550 (2), 4550-5050 (10), if average weekly wage is ₹3520, what is the value of k?
Answer
The correct answer is B: 15. Midpoints: 2300, 2800, 3300, 3800, 4300, 4800. Σf·x = 5·2300+10·2800+k·3300+8·3800+2·4300+10·4800 = 11500+28000+3300k+30400+8600+48000 = 126500+3300k.