A) 45%
B) 1.65%
C) 10%
D) 5%
The correct answer is: D)
First, transform the actual value of this outcome (1.2%) into its standardized zscore:
Z_{x}= [(X  u_{x}) ÷ σ_{x}] = [(1.2  12.0) ÷ 8] = 1.65
Using the Normal Rule, candidates should realize that approximately 90% of the outcomes are expected to occur within 1.65 standard deviations of the mean. This would mean that 45% (half of 90%) of the observations must lie within the mean and 1.65 standard deviations away from the mean. If this is so, then 5% of all the observations must lie below 1.65 standard deviations away from the mean.
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