Hi I don't know how to work out the standard deviation from this stem and leaf diagram (below), and the book says the answer is 13.7 and I have no idea how it got that. Thank you for any help.
What are the formulae for standard deviation for a (finite) discrete distribution? What do you have to calculate before you can calculate sn (or sn−1)?
What are the formulae for standard deviation for a (finite) discrete distribution? What do you have to calculate before you can calculate sn (or sn−1)?
Clive
I don't understand what that formula is for standard deviation as I have only been taught 2 so far. I managed to work it out by squaring every single number and adding them together to get the square of x and then using the standard deviation formula I have learnt at school, and managed to get the right answer. But thank you anyway