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4 Unit A2 2: Applied Mathematics (A-level only)

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Question 408

A company states that the probability that any one of its pens is defective is 0.08.

a.

For a random sample of 15 pens, find the probability that at least 2 are defective.

[2]
b.

An employee claims that the probability of a defective pen is greater than 0.08. In a random sample of 20 pens, 3 are defective. Test the claim at the 5% level of significance, stating your hypotheses clearly.

[5]
Markscheme

4 Unit A2 2: Applied Mathematics (A-level only) Questions

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