A-Level CAIE Mathematics A2 6.4.3—Sample mean Question Bank
6.4.3—Sample mean
• recognise that a sample mean can be regarded as a random variable, and use the facts that E X = n_ i and that Var X n 2 = v_ i
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EduNinjaEduNinja• recognise that a sample mean can be regarded as a random variable, and use the facts that E X = n_ i and that Var X n 2 = v_ i