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nilai: 3 4 5 6 7 8 9
frekuensi: 2 7 10 k 15 9 5
jawab
(3x2) + (4x7) + (5x10) + (6xk) + (7x15) + (8x9) + (9x5) = 6,3
2 + 7 +10 + K + 15 + 9 + 5
6 + 28 + 50 + 6k + 105 + 72 + 45 = 6,3
48 + k
306 + 6k = 6,3
48 + k
306 + 6k = 302,4 + 6,3 K
6,3k - 6k = 306 - 302,4
0,3 k = 3,6
k = 3,6/0,3
Jadi nilai k = 12