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pria = p
wanita = w
rata" seluruhnya = 6,5
p + w = 30
rata" p - rata" w = 0,6 maka rata" w = rata" p - 0,6
w = 17
dit :
rata" p = ?
jawab :
rata" seluruhnya = (jmlh w x rata" w) + (jmlh p. rata" p) per jmlh p+w
6,5 = (17. (rata" p - 0,6)) + (13 . rata" p) per 30
195 = 17 rata"p - 10,2 + 13 rata" p
205,2 = 30 rata"p
rata" p = 6,84