Question

After 2 hours of a particular shift, 2 defects have already been detected. What is the probability that there will be less than a total of 4 defects detected during the entire shift?

Answer 1

Answer:

The answer is $5/6$

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 = $no of defect / total defect$ = $4/24$

Therefore,

probability of less than 4 = $1- (4/24)$ = $5/6$