What is the z-score of sample X, if $n = 144, mu= 61, St. Dev. =12, and E[X] =62$ ?

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Answer 1 · 2016-11-14T12:38:54

The z-score $=1$

The z-score is given by

$=(barx-mu)/(sigma/sqrtn)$

Here, $barx=62$

$mu=61$

$sigma =12$

$n=144$

The z-score $=(62-61)/(12/sqrt144)=1/1=1$

What is the z-score of sample X, if n = 144, mu= 61, St. Dev. =12, and E[X] =62n = 144, mu= 61, St. Dev. =12, and E[X] =62?