سؤال في الاحصاء ضروري

[bayan J]

عندي سؤال مني فاهمه ايش حكايته
In certain company , it is known that 20% of the staff members are smoker . Arandom 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