Calculate mean, median values of this list water = [1,2,3,4,2,4,2,4,5,2,3,4,2,1,3,4,3,2,5,1]

def mean(numbers):
    total_sum = 0;
    for n in numbers:
        total_sum += n
    count = len(numbers)
    avg = total_sum / count
    return avg

def median(numbers):
    numbers.sort() #sort the list
    count = len(numbers) #get the length of the list
    isEven = count % 2 == 0 #check if this list is of even length
    
    if (isEven):
        #find the two numbers in the middle of the list
        mid = math.floor( count / 2 )
        a = numbers[mid - 1]
        b = numbers[mid]
        #find the average of these two numbers
        ans = mean([a, b])
    else:
        ans = numbers[math.floor( count / 2 )]
   
    return ans