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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 139

The time X X\,X minutes for a task is modelled by X∼N(80,62)X\sim N(80,6^2)X∼N(80,62). Independent samples of 16 times are taken.

a.

State the distribution of X‾\overline XX.

[2]
b.

Find P(X‾<78)P(\overline X<78)P(X<78).

[2]
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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