group$ freq
A  10.2
A  9.5
A  10.1
A  10
A  9.8
A  10.9
A  11.4
A  10.8
A  9.7
A  10.4
B  11
B  11.2
B  10.1
B  11.4
B  11.7
B  11.2
B  10.8
B  11.6
B  10.9
B  10.9