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I am building a code that needs to find the average of a set of scores in a list that can have amounts added and removed. I know how to find the average of a list of scores of a fixed number can someone help me on how to find the average if my list were to increase or decrease by an amount. Also i was wondering how to print the highest and lowest scores in this list. Thank you for any and all help.

solved thanks though

score = [10,10,9,9,6,5,2,1,0]
choice = None
while choice != 0:
    print \
    ("""
    Class Scores
    1 - Add a Score
    2 - Remove a Score
    3 - Average Score
    4 - High and Low Score
    5 - All Scores
    0 - Exit
    """)
    choice = float(input("Choice:"))
    if choice == 0:
        print ("Goodbye.")
    elif choice == 1:
      scores = int(input(("What score do you want to add?")))
      score.append(scores)
      print (score)
    elif choice == 2:
        scores = int(input("What score do you want to remove?"))
        score.remove(scores)
        print (score)
    elif choice == 3:
        ttl = sum(score)
        print(ttl/len(score))
    elif choice == 4:
        score.sort()
        score.reverse()
        end = len(score)
        print ("Highest scoreis:",score[0],"Lowest score is:",score[end-1])
    elif choice == 5:
        for score in score:
            print(score)
    else:
        print ("Not a valid choice!")
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