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

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Question 321

For a fair spinner, the probability of landing on 3 is 14\displaystyle \frac1441​.

a(i).

The spinner is spun 12 times. Find the probability that it lands on 3 exactly twice.

[1]
a(ii).

Find the probability that it lands on 3 more than four times.

[2]
b.

Alex believes that the spinner is biased towards 3. She spins it 40 times and it lands on 3 on 15 occasions. Test her claim at the 5% level of significance, stating your hypotheses clearly.

[4]
Markscheme

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

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