What is the reference you need?
Answer:
The answer is
Explanation:
This is because, if it takes 2 hours to detect 2 defects, In 24 hours, the total defect to be detected is 24.
The probabilty of less than (Total) of 4 defect =
1 - probability of it been 4 (in an entire shift)
probability of been 4 =
= 
Therefore,
probability of less than 4 =
= 
It’s C A major geological change
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