In the civilized manners with me in the activities of the seventh grade students of our school to organize a photography contest, the works submitted from March 1 to 31, the jury put the students subm

Solution: (1) according to the meaning of the histogram; from left to right the ratio of the height of each rectangle for 2: 3: 4: 6: 4: 1, can be obtained: the third group frequency = 0.2, and know that the third group of the frequency of 12,

The number of works to participate in the competition is = 60 pieces.

Answer: the number of works participating in the competition is 60.

(2) Read the figure can be obtained: the fourth group of the highest maximum, then its frequency is the largest;

that is, the fourth group participated in the largest number; for = 18 pieces.

Answer: the fourth group participated in the largest number of 18 pieces;

(3) the award rate of the fourth group is = 56%, the sixth group's award rate is = 67%,

comparison can be obtained: 56% <67%; so the sixth group has a high rate of awards.

Answer: The sixth group has a high winning rate.