Tolong ya dijawab no.8 beserta caranya!

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Tolong ya dijawab no.8 beserta caranya!

Tolong ya dijawab no.8 beserta caranya!

Jawaban Terkonfirmasi

rata".gab =  frac{rata" A . nA + rata" B . nB}{A + B}
              =  frac{7,3 X 12 + 6,8 X 18}{30}
              =  frac{87,6 + 122,4}{30}
              =  frac{210}{30}
              = 7