"Yippie,"yelled Yerkes, the Mad Genealogist, "I Now Have Birth Weight $\Sigma$

Multiple Choice

"Yippie,"yelled Yerkes, the mad genealogist, "I now have birth weight data of every Yerkes ever born. I am the last of the Yerkes, and I am sterile. Now, you can calculate the appropriate birth weight standard deviation of the Yerkes for me!"Given the data: $\Sigma$ X = 70, $\Sigma$ X ²=499,N=10, what is that standard deviation?

A) 0.90
B) 0.95
C) 1.00
D) none of the other alternatives are correct.