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Calculate with array function

Hi,

I want to calculate the average days between the moment a customer places an order, and the moment the order is delivered, weighted by the number of items ordered. For example 2 pieces in order 1 with order date of 10-8-09 and delivery 15-8-09 and 4 pieces in order 2 with orderdate of 8-8-09 and delivery date 15-08 would give 2x5 days+4x7 days=38 days divided by 6 pieces = 6,66as an average number of days.

With the NL function I am able to create the 3 arrays I need. However, how do I calculate this within just one cell.

Should I use the excel matrix functions by putting the arrays in 3 different cells and then multiply and divide with an excel matrix function?

Patrick Leunissen
Operations Manager
Entertainment Retail Group
The Netherlands

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