1.
import random
weather=[[random. randint(-20,0) for i in range(10)] for i in range(4)]
print(weather)
print((sum(weather[0])/10 + sum(weather[1])/10 + sum(weather[2])/10 + sum(weather[3])/10)/4)
2.
time=[int(input(str(i+1)+" спортсмен: ")) for i in range(8)]
print(sum(time)/8)