A Survey Asked 915 People How Many Times Per Week $\sigma _ { x ^ { * } }$

A survey asked 915 people how many times per week they dine out at a restaurant. The results are presented in the following table.

Consider the 915 people to be a population. Let X be the number of times per week a person dines out for a person sampled at random from this population.
Standard deviation $\sigma _ { x ^ { * } }$

A) 2.1
B) 1.5
C) 1.9
D) 2.2