N+(-8)=5 what does N=

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.

How do you convert 1.27 to a percentage

What is the range? can’t seem to find it out