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The college admissions office of york University is reviewing SAT scores . They gather 21 different...

The college admissions office of york University is reviewing SAT scores . They gather 21 different random samples of n = 49 scores. SAT scores are normally distributed in the population with a μ = 1050 and a σ = 210. If the mean is calculated from each sample, how much distance is expected on average between M and μ?

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0

4.29

10

30

45.83

math   Statistics-And-Probability   
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Answer #1

The population mean (mu)=1050

Standard deviation (sigma)=210

Sample size (n)=49

Standard error of sample mean= sigma/√n= 210/√49=30ans→30

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