If the Number of Parking Spots at Urban Grocery Stores $\le$

Multiple Choice

If the number of parking spots at urban grocery stores is uniformly distributed over the interval 90 to 140, inclusively (90 $\le$ x $\le$ 140) , then the standard deviation of this distribution is __________________.

A) 4.16
B) 50
C) 14.4
D) 7.07
E) 28.2