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A Set of Population Scores Along with Some Summary Information

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A set of population scores along with some summary information is listed below.
XX286474963652541639339\begin{array}{rr}\underline{X}& \underline{X^{2}} \\{8} & {64}\\7 & 49 \\6 & 36 \\5 & 25 \\4 & 16 \\\underline{3}& \underline{9}\\{3} &{39}\\\end{array}
a. What is the z-score for a raw score of 8?
b. What is the z-score for a raw score of 3?

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