What single decimal multiplier would you use to decrease by 19% followed by a 10% increase?
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The 70th percentile is the same as the cutoff recovery time 
such that every point above this time falls in the longest 30%, i.e.
Transform to the standard normal distribution:
where
is the z-score corresponding to the cutoff time , which is approximately 
. Solve for :
Transform to the standard normal distribution:
where