Table 5: Frequency distribution by value of "Test_a".

Test_a N. % Cumulative %
0 192 7.7 7.7
1 191 7.6 15.3
2 213 8.5 23.8
3 255 10.2 34.0
4 287 11.5 45.5
5 271 10.8 56.4
6 299 12.0 68.3
7 263 10.5 78.8
8 214 8.6 87.4
9 164 6.6 94.0
10 151 6.0 100.0
Total 2500 100