What is the z-score of X, if n = 394, $mu= 42$ , SD =11, and X =68?

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Answer 1 · 2016-06-18T05:56:45

$z=47.27$

Given -

$n=394$
$x=68$
$mu=42$
$sigma=11$

$SE=sigma/sqrtn=11/sqrt394=11/19.85=0.55$

$z=(x-mu)/(SE)=(68-42)/0.55=26/0.55=47.27$

What is the z-score of X, if n = 394, mu= 42mu= 42, SD =11, and X =68?