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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 114

In a manufacturing process for specialized solar cells, the probability that a cell is classified as 'High Efficiency' grade is 0.35.

Find the probability that

a.

in a random sample of 8 cells, exactly 2 are classified as High Efficiency.

[2]
b.

in a random sample of 20 cells, the number of High Efficiency cells is more than 10.

[3]
c.

A quality control manager inspects a large delivery of 400 cells.

Using a suitable approximation, determine the probability that the delivery contains fewer than 130 High Efficiency cells.

[4]
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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