frequency

percent

Valid percent

Cumulative percent

Valid

21 - 30

16

9.3

29.1

29.1

31 - 40

7

4.1

12.7

41.8

41 - 50

15

8.7

27.3

69.1

Over 50

17

9.9

30.9

100.0

total

55

32.0

100.0

Missing

System

117

68.0

Total

172

100.0