Предмет: Математика, автор: мадам

Пожалуйста помогите решить задачу: Пончик в начале четверти получил отметки: "2","2","3","4". Сколько пятерок ему надо получить, чтобы окончательная отметка была"4".
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Ответы

Автор ответа: seredadana

х-Количество пятерок. (2+2+3+4+5х)/(4+х)=4.
11+5х=16+4х.
х=16-11
х=5.
Удачи.

Автор ответа: Savelii666

5, т.к. оценка вычисляется с помощью нахождения среднего арифметического
(2+2+3+4+5+5+5+5+5)/9=4

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