Homework Answers
Machine 1
Produced 369 satisfactory pistons and 41 unsatisfactory pistons today.
Total pistons produced today = 369 + 41 = 410
Probability that machine 1 produced satisfactory pistons today = 369/410
Probability that machine 1 produced unsatisfactory pistons today = 41/410
Machine 2
Produced 350 satisfactory pistons and 150 unsatisfactory pistons today.
Total pistons produced today = 350 + 150 = 500
Probability that machine 1 produced satisfactory pistons today = 350/500
Probability that machine 1 produced unsatisfactory pistons today = 150/500
Probability that one piston chosen from machine 1 is unsatisfactory and the piston chosen from machine 2 is satisfactory = probability that machine 1 produced unsatisfactory pistons today * probability that machine 2 produced satisfactory pistons today
( Formula used 
, Here pistons selected from machine 1 and Machin 2 are randomly
and independently )
= 
= 
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