What does it mean to have a standard deviation of 0?
We will use the concept of standard deviation in order to find the required answer.
Answer: If we have a 0 standard deviation then it is clear that elements of the group are no different from the mean and hence, the list of elements doesn't differ from each other also. Every element is equal.
Let us see how we will use the concept of standard deviation in order to find the required answer.
The definition of standard deviation states that standard deviation is a quantity expressing by how much the elements of the group differ from the mean of the group.