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This video covers a "quick" recap of Year 7 probability with an excellent final section on finding the complement of probabilities ... otherwise ... finding the probability of something NOT happening if you know the probability of something happening.
This video is a recap of all the work which has gone before on Mean, Median, Mode and ... well ... that's it really as we're only dealing with the measures of centre. The range and IQR are known as the measures of spread. This video looks at how to find the Mean, Median and Mode and then it tries to thwart Barry by showing you how you can find missing numbers when they tell you the mean changes, but not the size of the new number. It's a great video to start Year 9 learning with.
This video take a look at how to create stem and leaf plots and is related to the Year 9 mathematics course. There are some examples where we look at creating a single stem and leaf plot showing how to make an unsorted and sorted stem and leaf plot. I then move on to looking at how to construct and read a back to back stem and leaf plot. There are examples used throughout. Lots of very exciting Mathematics to watch!
This video looks at how we can group data and show it. It looks at the ideas of histograms and how we can create them and read from them. It looks at the difference between a histogram and bar chart. There is a look at why we might want to write numbers in intervals and the best way to choose those intervals. It also takes a look at how we create a percentage frequency histogram. There is way too much fun happening in this video!
This video takes a look at the ways we can measure the spread of data about the median. It first looks at the range. It looks at how to calculate it and why it's not very useful when there are outliers. It moves on to look at the Interquartile Range. It shows how to find the IQR and what each of the parts mean. It also looks at how the IQR removes the problems created by the outlier. This video is part of the Year 9 series on Mathematics.
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These are the videos which are available in each chapter. You will notice that some are free and some are for subscribers only. Making and hosting these videos costs a little bit of money. To help pay for the hosting fees I have no choice but to hide some of the videos and make them for subscribers only.