سؤالين في الاحصاء .....

[bashboshah]

السلام عليكم ..... في سؤالين من نموذجات الفاينل اللي يعرف الحل ياريت يفيدنا




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?

B)
72\49


26. A die is rolled 5 times. the probability of getting a
number 4 one time only is
A) 0.015 B) 0.386 C) 0.167 D) 0.402