Solution: Suppose the number of people displaying 4 is A, the number of people displaying 9 is B, the number of people displaying 7 is C, the number of people displaying 1 1 is D, the number of people displaying 10 is E, and the number of people displaying 8 is F.

∴F+B=4×2=8

A+C=9×2= 18

B+D=7×2= 14

C+E= 1 1×2=22

D+F= 10×2=20

E+A=8×2= 16

∴A=6

B= 1

C= 12

D= 13

E= 10

F=7