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(4+7 + 3+4+p+7)/6 = 5
25 + p = 30
p = 5
maka p = 5
3, 4,4,5,7,7
maka mediannya = (4+5)/2 = 4,5
2. rata2 gabungan = (( 9x 5 + 6x 8) / (9+6)
= (45 + 48 ) / 15
= 6,2