Please help me! Thank you so much!

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

5cakes cost 3.50 how much do 7 cakes cost