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Assume the cholesterol levels in a certain population have mean µ= 200 and standard deviation σ = 24. The cholesterol 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 x = 180?

a. –3.75

b. –2.50

c. −0.83

d. 2.50

Sagot :

Answer is : b. -2.50
the correct answer will be B because of the sample score
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