Chapter 1 - Part 1 - Design of Experiments - Exercise Set A - Page 20: 14

(a) $10\%$ (b) $25\%$ (c) $25\%$ (d) $50\%$

(a) This is roughly 40 out of 400, equals to 10 out of 100 $=10\%$ (b) This is roughly 100 out of 400, equals to 25 out of 100 $=25\%$ (c) This is roughly 50 out of 200, equals to 25 out of 100 $=25\%$ (d) This is roughly 100 out of 200, equals to 50 out of 100 $=50\%$