Only do Problem 1, Problem 2, and Problem 4.

The quintessential program most students write when they first learn l/O is the "Hello, World" program. A "Hello, World" program only displays the statement "Hello, World" to the screen. a) Write a "Hello, World" program using only disp statement(s) b Write a "Hello, World" program using only fprintf statement(s) Repeat b) of Problem 1, but this time instead write the result to a text file on the desktop of your machine. Please note that we know that the file structure on your machine will likely differ from the file structures on our machines: we are primarily looking to examine your process when we review your work for this problem. Examine any previous piece of code you have written that has involved plotting. Use ginput to determine the x- and y-coordinates of several points on the plot. Write MATLAB code to prompt the user to enter a row or column vector. Then, calculate the mean of that vector. Print the value using fprintf statements: be sure to include labels and units. (For this problem you can select whatever units to use that you like.)