CAIE S1 2012 June — Question 1

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2012
SessionJune
TopicMeasures of Location and Spread
TypeCalculate variance from summary statistics
1 The ages, \(x\) years, of 150 cars are summarised by \(\Sigma x = 645\) and \(\Sigma x ^ { 2 } = 8287.5\). Find \(\Sigma ( x - \bar { x } ) ^ { 2 }\), where \(\bar { x }\) denotes the mean of \(x\).
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