Предмет: Алгебра, автор: nigoraholova2008

4. [3 балла] На зачетном уроке по бегу на 1000 м мальчики 8 класса показали следующие результаты: 3-й 210 1-й 2-й 175 250 4-й 5-й 6-Й 7-й 270 180 205 225 Составьте интервальную таблицу с шагом, равным 20. Найдите среднее арифметическое полученных результатов. 8-й 9-й 255 275 10-й 220

Ответы

Автор ответа: sodalla2

Ответ:

Объяснение:

Для составления интервальной таблицы с шагом 20 необходимо сначала найти минимальное и максимальное значения результатов бега на 1000 м:

Минимальное значение: 175

Максимальное значение: 275

Теперь мы можем разделить диапазон значений на интервалы шириной 20:

Интервал Границы интервала Количество учеников

1 160 - 179 2

2 180 - 199 2

3 200 - 219 2

4 220 - 239 2

5 240 - 259 1

6 260 - 279 1

Для нахождения среднего арифметического мы сначала найдем сумму всех результатов и количество учеников:

Сумма результатов: 210 + 175 + 250 + 270 + 180 + 205 + 225 + 255 + 275 + 220 = 2365

Количество учеников: 10

Среднее арифметическое = Сумма результатов / Количество учеников = 2365 / 10 = 236.5

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