Say what your country is famous for. What is your place (village, town, city) famous for? Use: — well-known people: writers, artists, poets, composers, sportsmen, businessmen, doctors

1) Общий рост всех 10-ти мальчиков 
4 * 1,45 + 2 * 1,35 + 4 * 1,5 = 5,8 + 2,7 + 6 = 14,5 (  метров )
2) Средний рост 
14,5 : 10 = 1,45 ( м )
ответ 1 метр 45 сантиметров

1,45*4+1,35*2+1,5*4/10=5,8+2,7+6/10=14,5/10=1,45
ответ:средний рост равен 1,45м.