Answer:
A
Explanation:
is the standard deviation of x.
The standard deviation is gotten by:
1. find the average of x-values (add up all the values and divide by number of numbers, which is 5)
2. subtract the average, x bar, from each of the values, square it, and add up the difference
3. Divide that final answer by n, which is 5
4. Take the square root of the answer
Now, let's find the average (x bar):
x bar =

Doing steps 2 & 3 together:

Doing step 4:

Correct answer is A