There are 21 chocolate box in a container with numbers from \(1\) to 21 marked on each of them. Then answer the following questions.
Questions:
(I) What is the probability of picking the chocolate box with number 9?
The probability of picking the chocolate box with number 9 \(=\) .
(II) What is the probability of picking the chocolate box with number 16?
The probability of picking the chocolate box with number 16 \(=\) .