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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 112

The lifetime of a battery is modelled by X∼N(50,62)X\sim N(50,6^2)X∼N(50,62) hours.

a.

Find P(45<X<55)P(45<X<55)P(45<X<55).

[3]
b.

State one feature of real battery lifetimes that could make the Normal model unsuitable.

[1]
Markscheme

4.2 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.2 Statistical distributions (A-level only)

328 exam-style questions on WJEC A Level Maths 4.2 Statistical distributions (A-level only), covering 4.2.1 Statistical distributions (A-level only), 4.2.2 Statistical distributions (A-level only), and 4.2.3 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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