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A final exam test score of 73 was transformed into a standard score of -1.5. If the standard deviation for the exam is 4, what

A final exam test score of 73 was transformed into a standard score of -1.5. If the standard deviation for the exam is 4, what is the mean of all final exam scores?

A.90
B.79
C.77
D.78
E.77.5

Please write in sentences in how you got the answer. Thank you

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