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a) 1/4 5/6 1/2 2/12 1/4 1/3 8/12
1+45+61+22+121+41+38+12=341
341/8=42,625
średnia arytmetyczna tych liczb to 42,625
5/6=0,83
1/2=0,5
2/12=0,16
1/4=0,25
1/3=0,3
8/12=0,6
0,25+0,83+0,5+0,16+0,25+0,3+0,6=2,89/7=0,41
(6/24 + 20/24 + 12/24 + 4/24 + 6/24+ 8/24 + 16/24) : 7 =
72/24 : 7 = 3 : 7 = 3/7