[υикиσωи]

المشاركة الأصلية كتبت بواسطة فيصل الفريد 3statistics professors and 7 chemistry professors are available to be advisors to a student organization. The student organization needs two of the professors to be advisors, what is the probability that both professors are chemistry professors? A) 0.111 B) 0.233 C) 0.100 D) 0.467

P(2C)=7C2\10C2=0.467

المشاركة الأصلية كتبت بواسطة فيصل الفريد 18. 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? A) 2 3 B) 49 72 C) 23 72 D) 49 24

P(R)=P(RandB1)orP(R and B2) or P(Rand B3)=5\8 x 1\3 +3\4x1\3 + 4\6x1\3

5\24 + 3\12 + 4\18 =


<<مالهم هيا دي الفكرة