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==================== per
20
=16+10+36+35+24 per 15
=121/20
=6,05
2.modus = 5(krna frekuensinya 7)
= 20 :5 = 4 = a.4
2. = a4
3, urutin dulu dari yang terkecil sampe yang terbesar terus ambil yang ditengah