To check the quality of two brands of lightbulbs, their life in burning hours was es timated as under for 100 bulbs of each brand. Life (in hrs) Brand 0-50 50-100 100-150 150-200 200-250 No. of bulbs...

Extracted text: To check the quality of two brands of lightbulbs, their life in burning hours was es timated as under for 100 bulbs of each brand. Life (in hrs) Brand 0-50 50-100 100-150 150-200 200-250 No. of bulbs 15 20 18 25 22 A Brand 8 60 25 В () Which brand gives higher life? (ii) Which brand is more dependable?