Task 3 ? Calculate and D (in Mpc) for each Ce- pheid. You could, of course, just do the same calcula- tion twelve times, but you can reduce the amount of work by, for example, writing a small program for a calculator or using a spreadsheet. Task 4 ? Consider the probable reasons why you do not find exactly the same distances for the different Cepheid variables. Task 5 ? Now you have calculated the distance to the twelve different Cepheid variable stars in M100. Does that give you the distance to M100? 10