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4.5 Statistical distributions (A-level only)

4.5 Statistical distributions (A-level only)

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Question 123

The battery life of a fully charged wireless keyboard, in hours, is Normally distributed with mean 50 hours and standard deviation 6 hours.

Hannah has a fully charged wireless keyboard.

a.

Find the probability that Hannah's keyboard lasts longer than 45 hours. Give your answer to 3 significant figures.

[1]
b.

Hannah has used her keyboard for 45 hours and it is still working. Find the probability that it lasts for at least another 10 hours. Give your answer to 3 significant figures.

[4]
Markscheme

4.5 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.5 Statistical distributions (A-level only)

284 exam-style questions on CCEA A Level Maths 4.5 Statistical distributions (A-level only), covering 4.5.1 Statistical distributions (A-level only) and 4.5.2 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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