The answer is 2.9. You would round up since there is a 5
Step-by-step explanation:







Basically because you can break any square root of non-perfect square into the square root of prime factors.
When the standard deviation = 0, there is no deviation at all. So the numbers are all the same. And there are seven of them. And the average is nine.
So the sample data set would just be seven 9s.
It should be 6 3/5 If not I’m sorry