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15x155 = 2325
4000+2325 = 6325
25+15 = 40
6325/40
= 158
tinggi rata 25 orng = 160 cm
tinggi rata 15 lainnya = 155 cm
maka :
> jmlh tinggi 25 orng = 160 x 25 = 4.000
> jmlh tinggi 15 lainnya = 155 x 15 = 2.325
jadi tinggi rata2 klmpk = (4.000+2325)/ 40 = 158,125