I'm going to upload the whole Basic Statistics Lecture series from Descriptive Statistics to Inferential Statistics.
Here's he first Statistics Powerpoint Lecture
Statistics Lecture One
In this Powerpoint topics covered are: Data Collection, Sampling Techniques and Summation Notation
Each topic is summarized and easier to understand rather reading a statistics book. clear examples are given and at the end of each lecture a short exercises is provided for check-up learning of your student.
This powerpoint lecture is animated, and answers in each exercises is provided.
I hope this will help your math class :)