Edexcel S1 2007 June — Question 6

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2007
SessionJune
TopicNormal Distribution
TypeMultiple probability calculations
6. The random variable \(X\) has a normal distribution with mean 20 and standard deviation 4 .
  1. Find \(\mathrm { P } ( X > 25 )\).
  2. Find the value of \(d\) such that \(\mathrm { P } ( 20 < X < d ) = 0.4641\)
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