2. Write a function that takes two strings as arguments. The function should return the number of times the second argument appears in the first. 3. Write a function that takes a list and an integer argument. The function should return a new list with each of the values of the argument list multiplied by the value of the integer argument. 4. Write a program that uses a dictionary to keep track of the grades associated with students. The keys of the dictionary should be student IDs and the values should be a list of grades. The user should be able to repeatedly specify a student number and the grade to add. When the user enters "quit" for the student number, print out the average grade for each student that had at least 1 grade entered. 5. Write a function that takes two string arguments. The function should return a new string value that is equivalent to the first argument with all of the occurrences of the second argument removed. For example, if the inputs are "My catdog's breath smells like catdog food" and "dog", the returned value should be "My cat's breath smells like cat food".