Jo Is a Hairstylist What Is the Standard Deviation of the Number of Clients

Multiple Choice

Jo is a hairstylist.The probability model below describes the number of clients that she may see in a day. $$\begin{array} { l | c c c c c c } \text { Number of clients } & 0 & 1 & 2 & 3 & 4 & 5 \\\hline \text { Probability } & 0.05 & 0.15 & 0.15 & 0.3 & 0.2 & 0.15\end{array}$$ What is the standard deviation of the number of clients that Jo sees per day?

A) 1.31
B) 1.41
C) 2.19
D) 1.99
E) 1.55