robtodd4248 robtodd4248
  • 19-06-2017
  • Mathematics
contestada

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 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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