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<?php

class Student
{
    public string $fio;
    public array $subjects;
    public string $gender;
    public string $group;

public function __construct(string $fio, array $subjects, string $gender, string $group)
    {
        $this->fio = $fio;
        $this->subjects = $subjects;
        $this->gender = $gender;
        $this->group = $group;
    }

public function avg(): float
    {
        return array_sum($this->subjects) / count($this->subjects);
    }
}

$ivanov = new Student('Панов Владислав Дмитриевич', ['Математика' => 90, 'Русский' => 70, 'Информатика' => 70], 'Мужской', 'ЭУ-219');
$petrov = new Student('Петров Петр Петрович', ['Математика' => 75, 'Русский' => 75, 'Информатика' => 65], 'Мужской', 'ЭУ-220');
$sidorova = new Student('Новокрещенова Анастасия Викторовна', ['Математика' => 95, 'Русский' => 80, 'Информатика' => 85], 'Женский', 'ЭУ-218');

$students = [$ivanov, $petrov, $sidorova];

usort($students, function ($a, $b) {
    return $b->avg() <=> $a->avg();
});

foreach ($students as $student) {
    echo $student->fio . " (" . $student->gender . " группа " . $student->group . ") Средний балл: " . number_format($student->avg(), 2) . "<br>";
}
?>

Results: