What do you call the well-defined collection of objects?

A(t)=728(1+0.04)^t how much money did aditya originally invest

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?