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1. In 2 - 4 sentences, explain what z-scores are and why we use them. 2. The grades on a math midterm have a mean

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1. In 2 - 4 sentences, explain what z-scores are and why we use them. 2. The grades on a math midterm have a mean of u =77 and standard deviation of o = 3.5. Tiff scored 80 on the exam. Find the z-score for Tiffany's exam grade. 3. For a population with mean = 100 and standard deviation = 20, what is the X value corresp to z = -0.50

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