Пошаговое объяснение:
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Пошаговое объяснение:
Мода ряда чисел - наиболее часто встречающаяся величина в ряде чисел. Ряд чисел может иметь более одной моды, а может не иметь моды совсем.
Медианой ряда, состоящего из нечетного количества чисел, называется число данного ряда, которое окажется посередине, если этот ряд упорядочить. Медианой ряда, состоящего из четного количества чисел, называется среднее арифметическое двух стоящих посередине чисел этого ряда, если этот ряд упорядочить.
1) 34,8; 63,1; 90,09; 90; 90,9 - всего 5 (нечётное количество) чисел.
В этом ряду чисел повторяющийся членов нет, значит нет моды.
Упорядочим
34,8; 63,1; 90; 90,09; 90,9
Медиана ряда чисел 90.
2) 421; 214; 124; 412; 421; 142 - всего 6 (чётное количество) чисел.
В этом ряду чисел 421 повторяется 2 раза, значит мода 421.
Упорядочим
124; 142; 214; 412; 421; 421
Медиана ряда чисел (214+421):2=635:2=317,5
3) 3; 3; 7; 8; 8; 8; 9; 9; 10; 11; 11; 15; 15; 15 - всего 14 (чётное количество) чисел.
В этом ряду чисел 8 и 15 повторяются по 3 раза, значит мода ряда 8 и 15.
Ряд чисел упорядочен.
Медиана ряда чисел (9+9):2=18:2=9
