I am at the solution for this problem located here: https://www.bartleby.com/questions-and-answers/during-the-morning-hours-at-a-catalog-sales-department-telephone-calls-come-in-at-the-rate-poisson-o/84d565ca-a1df-41b5-9faf-34fcebd84805 I just don't understand how they arrive with the solution below: 0.3903 = 1-P / 0.2963037 1-P = 0.1156. I just don't understand the math here. Any help in understanding will be extremely appreciate>

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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I am at the solution for this problem located here:  https://www.bartleby.com/questions-and-answers/during-the-morning-hours-at-a-catalog-sales-department-telephone-calls-come-in-at-the-rate-poisson-o/84d565ca-a1df-41b5-9faf-34fcebd84805     

I just don't understand how they arrive with the solution below:

 

0.3903 = 1-P / 0.2963037

1-P = 0.1156. 

I just don't understand the math here.  Any help in understanding will be extremely appreciate>

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