Based on the Edexcel syllabus.
I still don't get when you multiply the variance by a^2 and when you multiply by a. Help pls
The beefier example has an error, in the final part.
But they're being decommissioned so its cool
Great stuff. I intended to add in an example on how to explain the difference between multiplying a variable by a scalar and adding lots of a distribution, but you've also done this :-)