OCR S2 2011 January — Question 1

Exam BoardOCR
ModuleS2 (Statistics 2)
Year2011
SessionJanuary
TopicMeasures of Location and Spread
TypeStandard unbiased estimates calculation
1 A random sample of nine observations of a random variable is obtained. The results are summarised as $$\Sigma x = 468 , \quad \Sigma x ^ { 2 } = 24820 .$$ Calculate unbiased estimates of the population mean and variance.
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