Question 1196428
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mu = 20.6 = mean
sigma = 6 = standard deviation


note: 
sigma = sqrt(variance) = sqrt(36) = 6


Let's compute the z score for x = 25.1
z = (x - mu)/sigma
z = (25.1 - 20.6)/6
z = 4.5/6
z = 0.75


Answer: 0.75
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