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Answer :
Final Answer:
A score at or above the 90th percentile is:
C - 2.58 above the mean
Explanation:
A score at or above the 90th percentile means that the score is higher than 90% of the other scores in the dataset. This corresponds to being further out in the tail of the distribution, indicating an exceptional performance.
In a standard normal distribution (bell-shaped curve with mean of 0 and standard deviation of 1), the 90th percentile is approximately 1.28 standard deviations above the mean. However, the given options don't include this value, so we need to consider a broader range.
To find the score at or above the 90th percentile, we look for a value that's even further out in the tail. The closest option is C - 2.58 above the mean. This value represents an extreme score, which would place it at or above the 90th percentile in a standard normal distribution.
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