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  • 21-03-2024
  • Mathematics
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The mean tenure for a chief executive officer (CEO) was at least 9 years. A survey of 81 companies reported in The Wall Street Journal found a sample mean tenure of 8.1 years for CEOs with a standard deviation of 1.5 years. What is the z-score for this sample mean?
a) -0.6
b) -0.67
c) 0.6
d) 0.67

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