The Professional Product Owner book formulas

Last post 11:01 am February 23, 2021
by Scott Anthony Keatinge
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10:33 am February 23, 2021

Here are two formulas from the book

 

Revisiting the formula that ignored size variance:

50 PBIs (total) / 8 PBIs per Sprint (velocity) 3 2-week Sprints 5 12.5 weeks

When you take into account the size variance of the Product Backlog items by applying points, you end up with a revised end date:

160 points (total) / 19 points per Sprint (velocity) 3 2-week Sprints 5 16.8 weeks

 

I understand the calculations should be as follows:- 

50/8 = 6.25 which would then be multiplied by 2 (2 week sprints) in order to get 12.5 weeks for 50 PBIs. 

160/19 = 8.42 which would then be multiplied by 2 (2 week sprints) in order to get 16.84 weeks for 160 points. 

 

Can someone please let me know what the 3 & 5 numbers are supposed to mean, or are they typos? 

11:01 am February 23, 2021

I have a feeling that 3 should be X and that 5 should be =