1.1 You have an empty stack in which you perform the following sequence of operations: push ("customer 1") push ("customer 2") pop() push ("customer 3") peek() provide a visual description of the stack for operation performed on the stack (5 Marks) 1.2 Describe a recursive algorithm to compute the integer part of the base-two logarithm of n using only addition and integer division by writing the code in python. (5 Marks) 1.3 Write a function that calculates the average of an array by computing every element of an array A separately