اذا كان س متغيرا عشوائيا طبيعيا متوسطه  \mu\ =\ 45    وانحرافه المعيارى  \sigma\ =\ 5.

اجب عن أحد المطلوبين التاليين فقط :

1- اوجد :    ل\ \left(31\leس\le50\right)

2-اوجد:     ل\ \left(س\geك\right)=\ \ 0.5675

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