Median for Group Data (what am I doing wrong? - Image of working out attached)

[Brinkley23]

Hi All,

Can someone have a look over my workings out for finding the median of grouped data. I have attached the image of my working out and I cant figure out why I'm getting the answer 23.58...which I know is incorrect.

Thanks in advance!

 

[Dr.Peterson]

The group width is not 5, but 0.5!

(And thanks for explicitly stating that what you are calculating is the estimated median, not the actual median! I see too many people not making that distinction when they use this formula!)

 

[Brinkley23]

Oh my days, how did I not realise that! I knew it must have been something obvious, much appreciated Dr.Peterson.

 

[Dr.Peterson]

You didn't see how long I spent looking through what you wrote before seeing it ...