def zero_count(nums):
    from array import array
    
    n = len(nums)
    n1 = 0
    for x in nums:
        if x == 0:
            n1 += 1
        else:
          None
    return round(n1/n,2)
def zero_count(nums):
    from array import array
    n = len(nums)
    n1 = 0
    _x_i = 0
    while _x_i < len(nums):
        x = nums[_x_i]
       
        if x == 0:
            n1 += 1
        else:
            None
        _x_i += 1
    return round(n1 / n, 2)