You Want to Test Whether or Not the Following Sample

Multiple Choice

You want to test whether or not the following sample of 30 observations follows a normal distribution.The mean of the sample equals 11.83 and the standard deviation equals 4.53. $$\begin{array} { l l l l l l l l l l } 2 & 3 & 5 & 5 & 7 & 8 & 8 & 9 & 9 & 10 \\11 & 11 & 12 & 12 & 12 & 12 & 13 & 13 & 13 & 14 \\15 & 15 & 15 & 16 & 16 & 17 & 17 & 18 & 18 & 19\end{array}$$
The expected frequency in the 3rd interval is

A) 3.
B) 4.
C) 5.
D) 10.