Write an m-file called sumrand.m in Matlab to calculate the mean of a random number sequence generated with the command data = rand(10000,1). Your m.file should have two parts. In the first part, use for loops and the following equation

In other words, old-school programming. You may NOT use the mean function. You MUST use programming structures. The second part of your m-file should do the same calculations using the built-in matlab function mean.