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Two event are independent if P(A|B)=P(A) or P(B|A)=P(B)
A=event that the item pulled out is a plastic
B=event that the 10th grader recycled that item.
Calculating the conditional Probability
P(A|B)=P(A and B)/P(B) =(40/400)/(150/400)=40/150 =4/15
As both are not equal therefore they are not independent event.
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