http://vladiv.livejournal.com/ ([identity profile] vladiv.livejournal.com) wrote in [personal profile] shi_ra 2018-01-17 08:53 pm (UTC)

Все детки - специалисты учителей ругать.

Вот ей задачка. Средняя оценка по двум группам изучающих математику - 70
В первой группе 10 человек, и их средняя оценка - 80
Во второй группе - 5 человек. Какова средняя оценка во второй группе?
(29 comments)

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