Advanced Placement (AP)

The distribution of average wait times in drive-through restaurant lines in one town was approximately normal with mean μ=242 seconds and standard deviation σ=13 seconds. Amelia only likes to use the drive-through for restaurants where the average wait time is in the bottom 15% for that town.
What is the maximum average wait time for restaurants where Amelia likes to use the drive-through? Round to the nearest whole second.

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