Jawaban:
6.4 = 24
7.8 = 56
8.n = 8n
9.2 = 18
10.2= 20
total Nilai = 118+8n
total frekuensi = 16+n
Rata" = total Nilai/total frekuensi
7,5 = 118+8n/16+n
75/10 = 118+8n/16+n
75(16+n) = 10(118+8n)
7,5(16+n) = 118+8n
120+7,5n = 118+8n
120-118 = 8n-7,5n
2 = 0,5n
n = 4
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Jawaban:
6.4 = 24
7.8 = 56
8.n = 8n
9.2 = 18
10.2= 20
total Nilai = 118+8n
total frekuensi = 16+n
Rata" = total Nilai/total frekuensi
7,5 = 118+8n/16+n
75/10 = 118+8n/16+n
75(16+n) = 10(118+8n)
7,5(16+n) = 118+8n
120+7,5n = 118+8n
120-118 = 8n-7,5n
2 = 0,5n
n = 4