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f1 + f2 + f3 + ... + fi
= 9.36 + 7.37 + 10.38 + 8.39 + 6.40
9 + 7 + 10 + 8 + 6
= 324 + 259 + 380 + 312 + 240
40
= 1515
40
= 37,9
jadi yang benar A. 37,9
Keterangan : xi = data ke-i
fi = frekuensi ke-i