[hayat alroooh]

يسسسسسسسلمو اختي نبض الابتسامه فهمت بس ابى اعرف على اي اساس استخدمنا هدا القانون في سؤال 11
وفي كمان ده السؤال ابى اعرف الطريقه وعلى اي اساس 28. In a certain company, it is known that 20% of the staff members are smokers. A random
sample of 5 staff members is selected at random, let X represents the number of smokers
in the sample.
Find the probability that at most 4 staff members are smokers.
A) 0.00032
B) 0.0016
C) 0.8
D) 0.99968