Standard Deviation and Mean: Deliberate Practice

This task was influenced by one written by my good friend @offpistemaths.  I really recommend that teachers work through the task first to get a sense of what is going on, and to understand the connections properly between each set of questions.  This task should be non-calculator as there is a nice moment with surds which comes into play towards the end.  

Credit: @chrismcgrane84


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