16. A bank stipulates that if a bank card has 3 incorrect password attempts in one day, the card will be locked. Xiaowang went to the bank to withdraw money and found that he forgot his bank card password, but he is certain that the correct password is one of his 6 commonly used passwords. Xiaowang decides to randomly select one without replacement to try. If the password is correct, he stops trying; otherwise, he continues trying until the card is locked. (1) Find the probability that Xiaowang's bank card is locked that day; (2) Let $X$ denote the number of password attempts Xiaowang makes that day. Find the probability distribution of $X$ and its mathematical expectation.
16. A bank stipulates that if a bank card has 3 incorrect password attempts in one day, the card will be locked. Xiaowang went to the bank to withdraw money and found that he forgot his bank card password, but he is certain that the correct password is one of his 6 commonly used passwords. Xiaowang decides to randomly select one without replacement to try. If the password is correct, he stops trying; otherwise, he continues trying until the card is locked.\\
(1) Find the probability that Xiaowang's bank card is locked that day;\\
(2) Let $X$ denote the number of password attempts Xiaowang makes that day. Find the probability distribution of $X$ and its mathematical expectation.