How do you find the median, quartiles and inter-quartile range of a histogram?

Or is this even possible as histograms contain grouped, continuous data?



Would appreciate any reply. :-)How do you find the median, quartiles and inter-quartile range of a histogram?Well funny you should ask that I have a GCSE module 1 test tomorrow, and we need to know this.



Firstly, where the curve is you need to go to where the curve finishes and then follow across until you reach the y axis.



Let's say, the curve ends at 80.



You'd half 80 to give you 40, and go to 40 on the y-axis.

You'd do a straight line from 40 across, but stop as soon as you reach the curve.



Once you've met the curve, draw a straight line down to the x-axis. This will be your median.



To do the lower quartile, the same applies, you just need to half the median, so you'd go to 20 on the y-axis.



To find the upper quartile you'd go to 60, as this is 40 and the lower quartile or 20.



To fine the inter quartile range you'd do what ever you got for you upper quartile, minus what ever you got for your lower quartile.



Hope this helps. (: How do you find the median, quartiles and inter-quartile range of a histogram?median = middle value



upper quartile = 25 % of the upper data

lower quartile = 25% of the bottom data



Interquatile = upper quartile- lower quartile







http://www.bbc.co.uk/schools/gcsebitesiz鈥?/a>



this should help

How do you find the median, quartiles and inter-quartile range of a histogram?Maths gcse isit lol



i did that not soo long ago and struggled:(