robtodd4248 robtodd4248

19-06-2017
Mathematics

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The average score on an aptitude test is 80 with a standard deviation of 10. one person scored a 100. what is that person's z-score?

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mathmate mathmate

27-06-2017

Z-score for a variable X is calculated using
Z(x)=(x-mean)/standard deviation.
Here
mean=80
standard deviation=10
x=100
Z(100)=(100-80)/10=20/10=2

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