Question

Guys please please please answer these questions fast ​

Answer 1

Answer:

Step-by-step explanation:

1. a-a finite set

2. c- 90

3. a-7

4. c-16

5. a-n(n+1)/2

6. coefficient of variation:In probability theory and statistics, the coefficient of variation, also known as relative standard deviation, is a standardized measure of dispersion of a probability distribution or frequency distribution. It is often expressed as a percentage, and is defined as the ratio of the standard deviation to the mean.