Navigation: There are no figures for boys and girls in the question. We can assume that there are five girls and six boys.
① Total height:115× [5+5× (1+)] =1265 (cm).
(2) because the average height of girls is that of boys (1+ 10%=), the height of five girls is equivalent to (5×=)5.5 boys, so the average height of boys is:
1265 ÷ [(1+10%) × 5+6] =110 (cm)
Answer: The average height of boys in this class is 1 10 cm.