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3+7+8+9+4+3+5+6+4+8+7+7+6+6+5+4+5+4+3+6+8+10+6+5+4+6+8+10+9+9
30
=185 = 6,166 =6,17 ( B )
30
2. mean=
7+5+4+6+5+7+8+6+4+4+5+9+5+6+4
15
=85 = 5,66
15
banyak siswa yang nilainya di atas rataan adalah
=7,6,7,8,6,9,6= 7 orang ( C )
3. mean
(3x3) + (4x5) + (5x12) + (6x17) + (7x14) + (8x16) + (9x3)
70
= 445 = 6,35 - 1 = 5,35
70
Tidak lulus ujian = 3+5+12 =20 orang siswa (D)