OCR S2 2009 January — Question 2

Exam BoardOCR
ModuleS2 (Statistics 2)
Year2009
SessionJanuary
TopicCentral limit theorem
TypeFinding n from sample mean distribution

2 The continuous random variable \(Y\) has the distribution \(\mathrm { N } \left( 23.0,5.0 ^ { 2 } \right)\). The mean of \(n\) observations of \(Y\) is denoted by \(\bar { Y }\). It is given that \(\mathrm { P } ( \bar { Y } > 23.625 ) = 0.0228\). Find the value of \(n\).