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Statistics: Standard Deviation http://www.khanacademy.org/video/statistics--standard-deviation ---------------------------- يتناول هذا الفيديو حل مثال لايجاد الانحراف المعياري ---------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org