From Duke’s Registrar:
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Pratt (Engineering) Seniors
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Top?25?% cutoff: 3.874
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Trinity (Arts & Sciences) Seniors
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Top?25?% cutoff: 3.927
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Since the top 25% are at ~3.87–3.93, the median GPA (50th percentile) likely sits between 3.6 and 3.8 across colleges.