want an explanation why w=10 how we can know it

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.5: Multiplication With The Addition-or-subtraction Method
Problem 10MRE
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I want an explanation why w=10 how we can know it 

(iii). For 4 minute period,
A = 0.05*4 = 0.2
P(x>w) = 0.0487
P(x<=w) = 0.9513
P(x<=10) = 0.9513
therefore w =
10
Transcribed Image Text:(iii). For 4 minute period, A = 0.05*4 = 0.2 P(x>w) = 0.0487 P(x<=w) = 0.9513 P(x<=10) = 0.9513 therefore w = 10
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