Answer:
75%
Explanation:
We have the following table:
A B C
Customized 4 3 11
Non-Customized 12 7 17
If we ask the probability that the appliance is a Non-Customized model given that it was manufactured in Factory 'A'.
First we must calculate the total of the factory 'A', that is, Customized plus Non-Customized:
4 + 12 = 16
And the amount of Non-Customized in A is 12
Therefore the probability is:
12/16 = 0.75
There is a 75% chance that the event will occur.