Решение:
Определение числа групп. Число групп приближенно определяется по формуле Стэрджесса n = 1 + 3,2log n = 1 + 3,2log(100) = 7 Ширина интервала составит:
![](data:image/png;base64,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) Xmax - максимальное значение группировочного признака в совокупности. Xmin - минимальное значение группировочного признака. Определим границы группы.
Номер группы
| Нижняя граница
| Верхняя граница
| 1
| 0.2
| 14.44
| 2
| 14.44
| 28.68
| 3
| 28.68
| 42.92
| 4
| 42.92
| 57.16
| 5
| 57.16
| 71.4
| 6
| 71.4
| 85.64
| 7
| 85.64
| 99.9
|
Одно и тоже значение признака служит верхней и нижней границами двух смежных (предыдущей и последующей) групп. Для каждого значения ряда подсчитаем, какое количество раз оно попадает в тот или иной интервал. Для этого сортируем ряд по возрастанию.
0.2
| 0.2 - 14.44
| 1
| 3.7
| 0.2 - 14.44
| 2
| 6.5
| 0.2 - 14.44
| 3
| 6.8
| 0.2 - 14.44
| 4
| 7.1
| 0.2 - 14.44
| 5
| 7.3
| 0.2 - 14.44
| 6
| 7.4
| 0.2 - 14.44
| 7
| 8.9
| 0.2 - 14.44
| 8
| 9.5
| 0.2 - 14.44
| 9
| 10.9
| 0.2 - 14.44
| 10
| 11.6
| 0.2 - 14.44
| 11
| 11.7
| 0.2 - 14.44
| 12
| 11.8
| 0.2 - 14.44
| 13
| 12.1
| 0.2 - 14.44
| 14
| 14.4
| 0.2 - 14.44
| 15
| 15.2
| 14.44 - 28.68
| 1
| 15.4
| 14.44 - 28.68
| 2
| 16.7
| 14.44 - 28.68
| 3
| 17.1
| 14.44 - 28.68
| 4
| 18.2
| 14.44 - 28.68
| 5
| 20.0
| 14.44 - 28.68
| 6
| 20.6
| 14.44 - 28.68
| 7
| 22.9
| 14.44 - 28.68
| 8
| 26.1
| 14.44 - 28.68
| 9
| 27.1
| 14.44 - 28.68
| 10
| 28.1
| 14.44 - 28.68
| 11
| 28.4
| 14.44 - 28.68
| 12
| 28.8
| 28.68 - 42.92
| 1
| 29.2
| 28.68 - 42.92
| 2
| 29.6
| 28.68 - 42.92
| 3
| 30.2
| 28.68 - 42.92
| 4
| 31.3
| 28.68 - 42.92
| 5
| 31.5
| 28.68 - 42.92
| 6
| 31.9
| 28.68 - 42.92
| 7
| 32.2
| 28.68 - 42.92
| 8
| 32.2
| 28.68 - 42.92
| 9
| 33.6
| 28.68 - 42.92
| 10
| 35.0
| 28.68 - 42.92
| 11
| 36.4
| 28.68 - 42.92
| 12
| 37.4
| 28.68 - 42.92
| 13
| 37.8
| 28.68 - 42.92
| 14
| 39.2
| 28.68 - 42.92
| 15
| 40.1
| 28.68 - 42.92
| 16
| 42.2
| 28.68 - 42.92
| 17
| 44.8
| 42.92 - 57.16
| 1
| 46.1
| 42.92 - 57.16
| 2
| 46.7
| 42.92 - 57.16
| 3
| 46.7
| 42.92 - 57.16
| 4
| 46.9
| 42.92 - 57.16
| 5
| 48.0
| 42.92 - 57.16
| 6
| 49.2
| 42.92 - 57.16
| 7
| 49.5
| 42.92 - 57.16
| 8
| 49.6
| 42.92 - 57.16
| 9
| 50.6
| 42.92 - 57.16
| 10
| 51.6
| 42.92 - 57.16
| 11
| 53.0
| 42.92 - 57.16
| 12
| 53.2
| 42.92 - 57.16
| 13
| 53.7
| 42.92 - 57.16
| 14
| 54.4
| 42.92 - 57.16
| 15
| 56.7
| 42.92 - 57.16
| 16
| 57.1
| 42.92 - 57.16
| 17
| 57.7
| 57.16 - 71.4
| 1
| 59.6
| 57.16 - 71.4
| 2
| 60.2
| 57.16 - 71.4
| 3
| 60.4
| 57.16 - 71.4
| 4
| 61.7
| 57.16 - 71.4
| 5
| 64.1
| 57.16 - 71.4
| 6
| 65.1
| 57.16 - 71.4
| 7
| 65.4
| 57.16 - 71.4
| 8
| 65.8
| 57.16 - 71.4
| 9
| 66.4
| 57.16 - 71.4
| 10
| 69.0
| 57.16 - 71.4
| 11
| 69.6
| 57.16 - 71.4
| 12
| 70.3
| 57.16 - 71.4
| 13
| 70.5
| 57.16 - 71.4
| 14
| 70.7
| 57.16 - 71.4
| 15
| 74.6
| 71.4 - 85.64
| 1
| 77.2
| 71.4 - 85.64
| 2
| 77.5
| 71.4 - 85.64
| 3
| 78.6
| 71.4 - 85.64
| 4
| 80.6
| 71.4 - 85.64
| 5
| 80.6
| 71.4 - 85.64
| 6
| 83.5
| 71.4 - 85.64
| 7
| 83.8
| 71.4 - 85.64
| 8
| 84.0
| 71.4 - 85.64
| 9
| 86.1
| 85.64 - 99.88
| 1
| 86.2
| 85.64 - 99.88
| 2
| 86.5
| 85.64 - 99.88
| 3
| 88.1
| 85.64 - 99.88
| 4
| 89.4
| 85.64 - 99.88
| 5
| 89.9
| 85.64 - 99.88
| 6
| 90.0
| 85.64 - 99.88
| 7
| 91.5
| 85.64 - 99.88
| 8
| 92.5
| 85.64 - 99.88
| 9
| 93.1
| 85.64 - 99.88
| 10
| 94.0
| 85.64 - 99.88
| 11
| 94.6
| 85.64 - 99.88
| 12
| 97.6
| 85.64 - 99.88
| 13
| 99.3
| 85.64 - 99.88
| 14
| 99.9
| 85.64 - 99.88
| 15
|
Результаты группировки оформим в виде таблицы:
Группы
| № совокупности
| Частота fi
| 0.2 - 14.44
| 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
| 15
| 14.44 - 28.68
| 16,17,18,19,20,21,22,23,24,25,26,27
| 12
| 28.68 - 42.92
| 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44
| 17
| 42.92 - 57.16
| 45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61
| 17
| 57.16 - 71.4
| 62,63,64,65,66,67,68,69,70,71,72,73,74,75,76
| 15
| 71.4 - 85.64
| 77,78,79,80,81,82,83,84,85
| 9
| 85.64 - 99.88
| 86,87,88,89,90,91,92,93,94,95,96,97,98,99,100
| 15
|
Таблица для расчета показателей.
Группы
| xi
| Кол-во, fi
| xi * fi
| Накопленная частота, S
| |x - xср|*fi
| (x - xср)2*fi
| Частота, fi/f
| 0.2 - 14.44
| 7.32
| 15
| 109.8
| 15
| 623.712
| 25934.444
| 0.15
| 14.44 - 28.68
| 21.56
| 12
| 258.72
| 27
| 328.09
| 8970.232
| 0.12
| 28.68 - 42.92
| 35.8
| 17
| 608.6
| 44
| 222.714
| 2917.726
| 0.17
| 42.92 - 57.16
| 50.04
| 17
| 850.68
| 61
| 19.366
| 22.062
| 0.17
| 57.16 - 71.4
| 64.28
| 15
| 964.2
| 76
| 230.688
| 3547.797
| 0.15
| 71.4 - 85.64
| 78.52
| 9
| 706.68
| 85
| 266.573
| 7895.673
| 0.09
| 85.64 - 99.88
| 92.76
| 15
| 1391.4
| 100
| 657.888
| 28854.441
| 0.15
| Итого
|
| 100
| 4890.08
|
| 2349.03
| 78142.376
| 1
|
Для оценки ряда распределения найдем следующие показатели: Показатели центра распределения. Средняя взвешенная (выборочная средняя)
|