Menda pandas ma'lumotlar ramkasi bor x, y va z ustunlari bilan. x ustunlari bo'yicha guruhlashni va y ustunidagi a qiymatining o'rtacha paydo bo'lishini topishni xohlayman. Shuningdek, z qiymatining b bo'lmagan holatlarini ham sanab chiqing.
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