A ball contains three balls, one blue, one red, and one yellow. Every day, one ball is picked out of the bag and is then returned.
1) For how many days can you expect to not pick out a blue ball?
2) No blue balls have been drawn for one week. What is the probability one will not be drawn for at least one more week?
3) How many times on average will a blue ball be drawn in December?
4) What is the probability a blue ball will be drawn 1 to 30 times in that month?
Any help gratefully received... don't really get this :-( The only one I could try to get, but am not confident with, is the third one. If the chance of getting a blue ball is 1/3, and each drawing of a ball is independent, would it just be 31 (days in December) times 1/3 which would then be rounded to give 11 (rounded up) expected blue results?