Sorry guys,
  I am currently working and taking some summer courses. Normally, i do try to solve all my own problems but due to the lack of time, I have to put this question in sajha. I hope you guys will help me in solving this problem.

American eagle brand offers a customer discount through the use of coupons, historical data shows that 35% of the customers buying American Eagles used coupon. If you randomly selected 10 american eagles customer what is the probability that

exactly three of them used coupon
nine or more used coupon.

sagarmatha this question hardly takes 5 minutes to do  for the student of probablity and you are saying you have no time. I am not the expert on probablity and I may be wrong as well.  but Here is the answer I think.


P1 = 0.35......probablity of using coupon

P2=  0.65 not using a coupan


1.  question  ......... Exactly 3 uses coupon


3C10*(0.35) power 3  (0.65) power 7 =0.25

2. question  nine or more used coupon


9c10* (0.35) power 9 * (0.65) power 1 +10C10*(0.35)power10