Medie pătratică

Dacă a și b sunt numere reale pozitive media pătratică a acestora este

  • Generalizare: pentru n numere reale pozitive , , ..., formula mediei pătratice este

Exemplu: media pătratică a numerelor 1, 2, 3 este egală cu

În inegalitatea mediilor, această medie este mai mare decât cea aritmetică:

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