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CAIE A-Level Mathematics 6.1.2 The fact that if X Po+

Practise using the Poisson fact that the mean and variance are both λ when interpreting or forming a count distribution.

Syllabus
2028–2030
Course
Mathematics 9709
Level
A2

Exam points

  • use E(X)=λ and Var(X)=λ when a variable is given as Po(λ)

6.1.2—The fact that if X Po+ question 1

[Maximum number: 1]

The number of absences per week by workers at a factory has the distribution Po⁡(2.1)\operatorname{Po}(2.1).

Find the standard deviation of the number of absences per week.

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