<PRE><B>Question 1047566</B>
Make the total 1000
========defective==========non-defective======total
A-----------10.5===============139.5==========150
B========20================230===========250
C========48================432 ==========480
D=========6================114===========120
Total======84.5==============915.5=========1000

Probability it is defective is 8.45%, total defective over total
If defective, probability it came from B is 20/84.5 or 23.7%
If non-defective, probability it came from D is 114/915.5=12.5%

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