№1. 29

а) \(\frac{43{,}25+41{,}64+38{,}24+47{,}82}{4}=42{,}7375\approx\boxed{42{,}7}\).

б) \(\frac{7{,}126+5{,}364+3{,}275+1{,}932}{4}=4{,}42425\approx\boxed{4{,}424}\).