شرح سؤال ف الاحصاء

[Dr.mariam]

Urn 1 contains 5 red balls and
3 black balls. Urn 2 contains 3 red balls and 1 black
ball. Urn 3 contains 4 red balls and 2 black balls. If an
urn is selected at random and a ball is drawn, find the
probability it will be red.


لو سمحتو كيف طريقة الحل :") ..