I use this MS PowerPoint presentation file to kickoff our study of Statistics in my 9th grade Math I or Algebra I classes. It reviews the definitions and detailed methods required to calculate the mean, median, mode, range and standard deviation of a data set(s). It is a totally animated ppt file and very easy for students to understand. Any of the ppt animations can be modified as desired by the presenter (teacher). It also includes 2 example problems for the students to complete at the end of the slide pack if desired by the teacher. I have also included a copy of the Standard Deviation template I use to organize the data to calculate this parameter and this template is included as the last slide of the attached slide pack. As a side note, I always print out a copy of my ppt files for my students to retain in their math notebooks and to jot notes on while I present/review the slides.