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22-06-2017
Mathematics

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Betty scored 56 on a statistics test that had a mean of 65 and a standard deviation of 5. What was the Z- score on the test?

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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
x=56
mean=65
standard deviation=5
so
Z(65)=(65-56)/5=9/5=1.8

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