1.
def count_values(some_dict):
    value_set = set()

    for val in some_dict.values():
        value_set.add(val)

    return len(value_set)

2.
def min_key(some_dict):
    min_key = ""
    min_value = 2.0 # since these are probabilities, this will be larger than any

    for key in some_dict:
        if some_dict[key] < min_value:
            min_key = key
            min_value = some_dict[key]

    return min_key