NumSTU MEAN pct_free
56 716 9.6774193548
48 704 12
21 726 14.285714286
212 726 15.668202765
111 722 17.699115044
321 718 21.003134796
11 673 25
546 713 25.310559006
257 718 26.153846154
31 686 26.315789474
347 712 30.965909091
448 712 31.759656652
438 714 31.818181818
758 720 32.128514056
444 704 35.853131749
376 710 36.211031175
336 720 38.095238095
625 719 39.280125196
48 699 40.740740741
499 709 41.666666667
588 707 42.307692308
511 701 47.037701975
379 707 48.341232227
422 704 50.116550117
564 701 54.09015025
696 707 55.77746077
494 709 57.685009488
122 703 57.746478873
53 682 57.894736842
22 709 59.090909091
98 691 65.048543689
83 701 70.238095238
19 676 73.684210526
13 687 84.615384615