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Jika 30 siswa kelas IIIA1​ . mempunyai nilai ratarata 6,5; 25 siswa kelas IIIA2​ mempunyai nilai rata-rata 7, dan 20 ~iswa kelas IIIA3​ memiliki 'nilai rata-rata 8. Maka rata-rata nilai ke-75 anak siswa kelas III tersebut adalah ...

Pertanyaan

Jika 30 siswa kelas I I I A subscript 1 . mempunyai nilai ratarata 6,5; 25 siswa kelas I I I A subscript 2 mempunyai nilai rata-rata 7, dan 20 ~iswa kelas I I I A subscript 3 memiliki 'nilai rata-rata 8. Maka rata-rata nilai ke-75 anak siswa kelas III tersebut adalah ...

  1. 7,16

  2. 7,10

  3. 7,07

  4. 7,04

  5. 7,01

K. Putri

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Ganesha

Jawaban terverifikasi

Pembahasan

N i l a i space r a t a minus r a t a space k e l a s space I I I A subscript 1  6 comma 5 equals fraction numerator sum for blank of f subscript 1 over denominator 30 end fraction  begin inline style sum for blank of end style begin inline style f subscript 1 end style begin inline style equals end style begin inline style 195 end style  space begin inline style N end style begin inline style i end style begin inline style l end style begin inline style a end style begin inline style i end style begin inline style space end style begin inline style r end style begin inline style a end style begin inline style t end style begin inline style a end style begin inline style minus end style begin inline style r end style begin inline style a end style begin inline style t end style begin inline style a end style begin inline style space end style begin inline style k end style begin inline style e end style begin inline style l end style begin inline style a end style begin inline style s end style begin inline style space end style begin inline style I end style begin inline style I end style begin inline style I end style begin inline style A subscript 2 end style begin inline style space end style  7 begin inline style equals end style fraction numerator sum for blank of f subscript 2 over denominator 25 end fraction begin inline style space end style  sum for blank of begin inline style f subscript 2 end style begin inline style equals end style begin inline style 175 end style begin inline style space end style  N begin inline style i end style begin inline style l end style begin inline style a end style begin inline style i end style begin inline style space end style begin inline style r end style begin inline style a end style begin inline style t end style begin inline style a end style begin inline style minus end style begin inline style r end style begin inline style a end style begin inline style t end style begin inline style a end style begin inline style space end style begin inline style k end style begin inline style e end style begin inline style l end style begin inline style a end style begin inline style s end style begin inline style space end style begin inline style I end style begin inline style I end style begin inline style I end style begin inline style A subscript 3 end style  space begin inline style 8 end style begin inline style equals end style fraction numerator sum for blank of f subscript 3 over denominator 25 end fraction begin inline style space end style begin inline style sum for blank of end style begin inline style f subscript 3 end style begin inline style equals end style begin inline style 160 end style

Maka rata-rata keseluruhan kelas III adalah

space begin inline style x end style begin inline style equals end style fraction numerator 195 plus 175 plus 160 over denominator 75 end fraction begin inline style equals end style 530 over 75 begin inline style equals end style begin inline style 7 end style begin inline style comma end style begin inline style 07 end style

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Diketahui suatu kumpulan data sebagai berikut. (m + 1 ), (m − 1 ), (5m − 5), dan (m + 1) a. Nyatakanlah rataan dan simpangan baku data di atas dalam m. b. Tentukanlah nilai m jika rataan sama dengan...

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