The sample mean for a recent introductory psychology test was 78, and the sample variance was 9.If a student's z- score = -2.0, what was this student's raw test score?

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The Answer of The sample mean for a recent introductory psychology test was 78, and the sample variance was 9.If a student's z- score = -2.0, what was this student's raw test score?

The Sample Mean for a Recent Introductory Psychology Test Was