(20 12? In order to improve the water-saving awareness of the citizens in Shenyang, the relevant departments conducted a random survey of some citizens on "the most effective water-saving measures you think". Solution: (1)75÷ 15%=500 people;

(2)n=25500× 100%=5%，

m = 1-20%- 15%-25%-5% = 1-65% = 35%，

(3) Number of people in group A: 500×20%= 100,

Number of people in group C: 500×35%= 175,

Complete the statistical chart as shown in the figure: