Вот код:

import random

# Сгенерируем список

lst = [random.randint(-30, 30) for _ in range(30)]

# 1

result = 1

for item in lst:

   if item < 0:

       result *= item

print(result)

# или

from functools import reduce

print(reduce(lambda x, y: x * y,

            filter(lambda item: item < 0, lst)))

# 2

max_count = 0

count = 0

for item in lst:

   if item < 0:

       count += 1

       if count > max_count:

           max_count = count

print(max_count)

# 3

result = 0

for item in lst:

   if item < 0:

       result += item

print(result)

# или

negative_nums = list(filter(lambda item: item < 0, lst))

print(sum(negative_nums) if negative_nums else "NO")