Cause it's already hard thou
Hope this help hahahahaha
No because the sum could also be irrational number which for example it could be square root of 9 or 49
Hope this helps answer your question
-349.3 i think u didnt show the answers we choose from /my answer probably wrong i was assuming.
The standard deviation is the square root of the variance...so that means the variance is the standard deviation squared.
2.3^2 = 5.29 <===
There was a 200% increase