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Me an = (5.2 + 6.4 + 7.2+ 8.1) / (2+4+2+1)= (10+24+14+8) / 9
= 56/9
= 6 2/9
median = data ke 1/2(10) = 5
median adalah data ke-5 = 6
modus = 6
mean + median + modus = 6 2/9 +6 +6
= 18 2/9