Consider the Following Information The Number of Runs Up and Down for the Preceding

Multiple Choice

Consider the following information: $$\begin{array} { l r r r r r r } \text { Observations } & 1 & 2 & 3 & 4 & 5 & 6 \\\hline \text { Num. of defects } & 10 & 18 & 13 & 15 & 9 & 12\end{array}$$ The number of runs up and down for the preceding data is:

A) 3.
B) 4.
C) 5.
D) 6.
E) none of these.