Excel- Average days between group of dates -

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i'm trying use excel calculate average frequency of delivery set of parts. have data set has 2 columns- part number , delivery date. i'm trying figrue out out oftne parts delivered, on average, in terms of days. tried using nested ifs averageif(a2=a2:b9999,datedif(xx)) etc, no avail. i'm looking this:

input:

part    8.1 part    8.8 part    8.15

output: part average delivery - every 7 days

etc etc. ideas?

if dates in columnb: 

=(max(b:b)-min(b:b)--1)/count(b:b)

or: 

=(max(b:b)+1-min(b:b))/counta(b:b)

should serve.

edit

if have multiple parts (the above assumed one) , list in no particular order pivottable may best (say top left-hand corner in d1), in tabular form part row labels , delivery 3 times Σ values (the first max, second min , third count). =(1+e3-f3)/g3 copied down should give average bumber of days between deliveries. example 5 in example (3 deliveries in 15 days).


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