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<p>a. Banyak siswa yang gemar melukis</p><p>&nbsp; &nbsp; &nbsp;Melukis = 100% - (30% + 25% + 15% &nbsp;+ 20%)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 100% - 90%</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 10%</p><p>&nbsp; &nbsp; &nbsp; &nbsp; %melukis/%Membaca = Melukis/Membaca</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;10%/20% = Melukis/40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1/2 = Melukis/40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Melukis = 40/2 = 20 Orang</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Jadi, banyak siswa yang gemar melukis adalah 20 siswa</p><p>&nbsp;</p><p>b. Banyak siswa seluruhnya = 100%/20% x 40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 5 x 40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 200 orang</p><p>&nbsp;</p><p>c. Modusnya adalah Menyanyi</p><p>&nbsp; &nbsp; &nbsp;Menyanyi = 30%/20% x 40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 3/2 x 40</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 60 orang</p><p>&nbsp; &nbsp; &nbsp;Frekuensinya adalah 60</p>