vars  n  mean    sd median trimmed   mad min max range  skew kurtosis   se  IQR Q0.1 Q0.25 Q0.75  Q0.9
Prova1    1 21 60.76 29.98   67.0   62.18 34.10   9 100    91 -0.32    -1.26 6.54 44.0 18.0 42.00 86.00 100.0
Prova2    2 21 58.76 25.19   50.0   58.24 28.17  15 100    85  0.19    -1.28 5.50 39.0 31.0 41.00 80.00  95.0
Prova3    3 20 50.10 26.59   50.5   50.56 35.58   0  94    94 -0.13    -1.04 5.94 42.5 18.8 26.75 69.25  80.2