If X Is Uniformly Distributed Over the Interval 8 to 12,inclusively

Multiple Choice

If x is uniformly distributed over the interval 8 to 12,inclusively (8 $\le$ x $\le$ 12) ,then the standard deviation of this distribution is ___.

A) 4.00
B) 1.33
C) 1.15
D) 2.00
E) 1.00