Final answer:
In the field of Computers and Technology, this question is about implementing stack operations such as reversing, sorting, removing duplicates, and calculating the mean of elements.
Step-by-step explanation:
The subject of this question is Computers and Technology.
To reverse the stack, you can use the push() and pop() operations to transfer the elements to a temporary stack in reverse order.
To sort the stack elements, you can consider using the push() and pop() operations along with a temporary stack to perform a sorting algorithm such as bubble sort or insertion sort.
To remove duplicates from the stack, you can use a hash set or a temporary stack to store the unique elements.
To calculate the mean of the stack elements, you can iterate through the stack and calculate the sum of all elements, then divide by the number of elements.