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7,3 = (5.1+6.5+7.6+8.x+9.3+10.1) / (1+5+6+x+3+1)
7,3 = (114 + 8x) / (16 + x)
7,3 (16 + x) = 114 + 8x
116,8 + 7,3x = 114 + 8x
7,3x - 8x = 114 - 116,8
-0,7x = -2,8
x = 4
b) modus = 7
median = (7 + 8)/2 = 7,5