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I am given a list of ages from 29-73 and I am asked to calculate what values fall within the middle $95%$,top $10%$, and $P20$ Any help would be greatly appreciated

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    $\begingroup$ Do you really need to use the norminv function? It seems to me that the answer is easier using percentile. $\endgroup$ – Ertxiem - reinstate Monica Oct 14 at 22:25

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