(a) (2×200+6×201+3×202+203+204)/13=(400+1206+606+203+204)/13=
2619/13=201.5cm approx is the mean to 1 decimal place.
(b) The new sum is 2619+x where x is the new player’s height, and there are now 14 players.
So (2619+x)/14=201, 2619+x=14×201=2814, so x=2814-2619=195cm.