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70 x 4 = 280
75 x 8 = 600
80 x 6 = 480
85 x m = 85m
90 x 4 = 360
total = 280 + 600 + 480 + 85m + 360 = 1720 +85m
mean = 79
frekuensi = 8 + 6 + m + 4 = 22+m
dikalikan silang
1720+ 85m = 1738 + 79 m
6m = 18
m = 3
b. median = 25+1 : 2 = 13