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rata rata = 4x5 +7x6 + 4x7 +9x8 + 6x9 / 4 +7 + 4 + 9 + 6
= 20 + 42 + 28 +72 +54 / 30
= 216 /30
= 7,2 B
4.
n = 30
n/2 dan n/2 +1
30/2 dan 30/2 + 1
15 dan 16
.
median = 1/2 ( 80 + 80 )
median = 1/2 (160)
median = 80
( C )