7. Stress levels (measured by cortisol volume) in a certain population are normally distributed and have mean µ= 200 milliliters and standard deviation o = 24 milliliters. Stress levels for a random sample of n=9 individuals are measured and the sample mean (x) is determined. What is the z-score for a sample mean = 180? а. -3.75 b. -2.50 с. -0.83 d. 2.50

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