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Formula for even averages

Hi,

Probably more a maths question but any help would be appreciated - racking my brain with this.

I have attached a spreadsheet because I feel this is quite complicated to explain.

Basically I have a list of area numbers and associated costs. For Area the Min is 3 and the Max is 2658

I have split it into 10, based on steps of 266 ((2658 - 3) / 10) but - it doesn't give me an even count. The data is heavily weighted towards the 2nd point ( 3 & 266 ) - this makes up 45% of the full data - the 2nd half of the table (points 5-10) account for only 20% of the full data - and I would like to create a way that it (dynamically adjusts) to create an even count for each 10 datapoints.

There is also a chart in here to visualize this - the ideal chart will have a straight line for count - for each step in the 10 steps there should be an even number of datasets in that category.

Please let know if I have explained this badly.
 

Attachments

Here's my crack at it ... I just used ceiling to divide your data into groups of 20 and pivoted off the result ... The data doesn't seem to make a lot of sense - poor correlation between area and ££s ... but I'm rushing to meet a conf call ...
 

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