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2 Statistics

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Question 134

Four valves operate independently. Each valve fails to open with probability 0.02. A process stops if at least two valves fail to open.

a.

Find the probability that the process continues.

[4]
b.

In 500 independent runs, find the expected number on which the process stops.

[1]
c.

Explain how a shared control fault would affect the independence assumption.

[1]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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