What is the method to determine the quantile corresponding to the highest 1%?

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The method to determine the quantile corresponding to the highest 1% is to subtract 1% from 100%, which is equal to 99%. Then, divide 99% by 100 to get 0.99. This is the probability associated with the 99th percentile or the highest 1%. Finally, use a quantile function or a z-score table to determine the value of the quantile associated with the desired probability.