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(6,4 × 10) = 56 + x
64 = 56 + x
x = 64 - 56
x = 8
b) 4,5,5,6,6,6,7,8,8,9
median = (6 + 6 )÷ 2 = 6
5, 6, 5, 4, x, 7, 9, 8, 6, 6
4, 5, 5, 6, 6, 6, 7, 8, 9, x
4 + 5 + 5 + 6 + 6 + 6 + 7 + 8 + 9 + x
6,4 = ----------------------------------------------
10
56 + x
6,4 = ---------
10
6,4 x 10 = 56 + x
64 = 56 + x
x = 64 - 56
x = 8
Yang B
4, 5, 5, 6, 6, 6, 7, 8, 8, 9
↓ ↓
6 + 6 = 12 = 6
2 2