1-4/7*4/7-3/7*3/7 = 0.4897959
1-2/5*2/5-3/5*3/5 = 0.48
GINI = (7/12) * 0.4898 + (5/12) * 0.48 = 0.486
1-1/5*1/5-4/5*4/5 = 0.32
1-5/7*5/7-2/7*2/7= 0.4081633
GINI = (5/12) * 0.32 + (7/12) * 0.408 = 0.37
4/20*(1-1/4*1/4-3/4*3/4) + 8/20*(0) + 8/20*(1-1/8*1/8-7/8*7/8) = 0.1625
1-4/7*4/7-3/7*3/7 = 0.4897959 1-2/5*2/5-3/5*3/5 = 0.48 GI...
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