> on average You can "expect" but if you only have one lock to unlock, it can be anything from 1 to 1000 attempts. If you had 1000 locks, you can expect that

> on average You can "expect" but if you only have one lock to unlock, it can be anything from 1 to 1000 attempts. If you had 1000 locks, you can expect that the average would be 500 (if the numbers were truly random), but it still means that you might need one try for some locks, and 999 tries for some other lock.