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A manufacturer of batteries knows that 10% of the batteries produced by a particular production line are defective. A sample of 200 batteries is removed for testing.

AWhat is the probability that exactly 20 batteries in the sample are defective?

[2 marks]

BWhat is the probability that at least 20 batteries in the sample are defective?

[7 marks]

Verified Answer :

antonsandiego

I think you need only an answer without expanation so let's start.
a) \(P = \frac{200!}{180!x20!} * 0,1^{20}*0,9^{180} = 0.093636\)
b) \(Probability = 0.5 + \frac{1}{2} (0.093636) = 0.54682\)

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