Rose is $$150\rm cm$$ tall. Rose\textquotesingle s older brother Quentin is $$10 \rm cm$$ taller than Rose is. Rose\textquotesingle s younger brother Sam is $$4 \rm cm$$ shorter than Rose is. What is the average of the heights of Rose, Sam, and Quentin? 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
Rose is $$150\rm cm$$ tall. Quentin is $$10 \rm cm$$ taller than Rose, so Quentin is $$160 \rm cm$$ tall. Sam is $$4 \rm cm$$ shorter than Rose, so Sam is $$146 \rm cm$$ tall. Their average height is $$ (150+160+146)\div3 =152 \rm cm$$. 