Question

A manufacturer has shipped 40 cameras to an electronics​ store, of which 4 are defective. If...

A manufacturer has shipped 40 cameras to an electronics​ store, of which 4 are defective. If the electronics store sold 26 cameras before discovering that some were​ defective, what is the probability that at least one defective camera was​ sold?

Math   Statistics-And-Probability   
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Answer #1

P[ camera is defective ] = 4/40

P[ camera is defective ] = 0.1

Camera sold = 26

We need to find P[ at least one defective was sold ]

P[ at least one defective was sold ] = 1 - P[ zero defective was sold ]

P[ zero defective was sold ] =

P[ zero defective was sold ] =

P[ zero defective was sold ] = 0.6445

P[ at least one defective was sold ] = 1 - 0.6445

P[ at least one defective was sold ] = 0.3555

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