Could you help me with this problem in Python / me podrian ayudar con este problmea en Python

Start here: The Python Tutorial — Python 3.8.5 documentation[^]
or here: Python Tutorial - Tutorialspoint[^]

There you'll find an example how to find average value of a list of values: Find average of a list in python - GeeksforGeeks[^]

Quote:

reads the grades of 3 students from the 4 months of the cycle

You might want to use Improve question to outline from what/where and how the data is going to be read - ie file, csv/tsv or keyboard

For now, I suggest you look at Python arrays, using 'for' to iterate them for example .. you could also use a simple 'driver' to get started, reading the number of elements and the elements themselves from the keyboard as in

# creating an empty list 
lst = [] 
  
# number of elements as input 
n = int(input("Enter number of elements : ")) 
  
# iterating till the range 
for i in range(0, n): 
    ele = int(input()) 
  
    lst.append(ele) # adding the element 
      
print(lst)

that gives you an array (lst) of 'string', it's simple enough to declare and add the data as integers, but that would be doing your homework for you.