How do I follow the constraints?

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This kid took N classes last semester and wants to know her average mark.
Average mark is the sum of her marks divided by the number of courses she took.
N lines follow, each containing a single nonnegative integer ai, indicating Pusheen's mark in class i.

Constraints
-N∈{1,2,5,10}

-0≤ai≤100

-In tests worth 3 marks, N=1.

-In additional tests worth 5 marks, N=10.

I dont understand what the constraints mean

What I have tried:

number = int(input())
sumOfMark = int(input())
if number == 1:
  print(round((sumOfMark/number),1))
elif number == 2:
  print(round((sumOfMark/number),1))
elif number == 3:
  print(round((sumOfMark/number),1))
elif number == 10:
  print(round((sumOfMark/number),1))

Posted 1-Feb-19 19:28pm

RV2020

Updated 1-Feb-19 19:44pm

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OriginalGriff · Answer 1 · 2019-02-01T19:45:00

Quote:
I dont understand what the constraints mean

N∈{1,2,5,10}

N can only value values in this list: 1, 2, 5, or 10. No other values of N are valid

0≤ai≤100

Each of the N lines has a single value, which is between 0 and 100 inclusive.

In tests worth 3 marks, N=1.

In additional tests worth 5 marks, N=10.

These are obvious.

N is the number of courses, ai is the grade for each course i

If you still don't understand, you need to talk to your tutor.