Hi,

Great! on showing the Sums..will leave reducing Up to You

NO PARTICLES       PARTICLES   TOTAL

Good           320              14         334

 bad            80                36         116

               400                 50          450



Suppose that a wafer is selected at random.What is the probability that the wafer is

a.is good  334/450

b.has no particles  400/450

c.is good and has no particles  320/450

d.is good or has no particles  334/450 + 400/450 - 320/450

e.is good given that it has no particles 

f.has no particles,given that its good  

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