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20 13 Shanghai Senior Three Mathematics Yimei
Solution: (1)∵ There are 22 class B students, the largest number.

∴ The mode at the class level is B;

(2) According to the histogram:

The percentage of Class A is:1450×100% = 28%;

The percentage of Grade B is 2250×100% = 44%;

The percentage of Grade C is:1050×100% = 20%;

The percentage of Grade D is 450×100% = 8%;

The following picture is shown:

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