Prob and Stats questions (2) please help?

in a typical day, 22% of the people in the US with internet service go online to get the news. In a random sample of five people in the US with internet service, what is the probability that the number is going online to get the news is:





(A) Exactly two


(B) At least two


(C) At most two





Only 32% of cell phone users over 50 carry their cell phone switched on everyday. In a random sample of 10 users over 50 what is the probability that the number with their phone switch on is:





(A) Exactly five


(B) More than five


(C) Less than five

Prob and Stats questions (2) please help?
For the first, P(number going online for news is exactly k) is:





0 0.288717436800


1 0.407165616000


2 0.229683168000


3 0.064782432000


4 0.009135984000


5 0.000515363200





Just combine them and add them as needed.





Likewise, for the second:





0 0.0211392282015720880000


1 0.0994787209485745450000


2 0.2106608208322755200000


3 0.2643586771228556000000


4 0.2177071458658810800000


5 0.1229405059007328700000


6 0.0482119630983266210000


7 0.0129645615054323710000


8 0.0022878637950763010000


9 0.0002392537302040576300


10 0.0000112589990684262430
Reply:b





c

apricot