OCR S2 2009 June — Question 2

Exam BoardOCR
ModuleS2 (Statistics 2)
Year2009
SessionJune
TopicApproximating the Poisson to the Normal distribution
TypeJustify use of normal approximation
2 The random variable \(D\) has the distribution \(\operatorname { Po } ( 20 )\). Using an appropriate approximation, which should be justified, calculate \(\mathrm { P } ( D \geqslant 25 )\).
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