Quartiles are the values that divide a data set into quarters: Put the values in order Divide the list into four equal parts The Quartiles are at the divisions The interquartile range shows the range ...

THE crabs measured by Prof. Weldon, which were 12˙5 centimetres long, had the ratio of frontal breadth to carapace length equal to 778˙39 thousandths with a quartile deviation of 10˙79; the adult ...