What is the z-score of sample X, if #n = 55, mu= 38, St. Dev. =66, and mu_X =43#?

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Answer 1 · 2016-12-16T10:32:45

The answer is #z=0.56#

The z-score for a sample mean is

#z=(barx-mu)/(sigma/sqrtn)#

#barx=mu_x=43#

#mu=38#

#sigma=66#

#n=55#

#z=(43-38)/(66/sqrt55)#

#=5/8.9=0.56#