The question is from an edexcel non-calculator paper...

The paper is the first link here, from google search:

And the question is number 15.

From the graph, the min and max weights are 160 and 190 grams.

But the next page says its 153 and 186 grams,

So I'm confused as to where the median and upper and lower quartiles should actually be.

Can anyone help, I'm not too sure, thanks.