In a Completely Randomized Design Involving Three Treatments, the Following

Multiple Choice

In a completely randomized design involving three treatments, the following information is provided: $$\begin{array} { l l l l } & \text { Treatment 1 } & \text { Treatment 2 } & \text { Treatment 3 } \\\text { Sample Size } & 5 & 10 & 5 \\\text { Sample Mean } & 4 & 8 & 9\end{array}$$
The overall mean (the grand mean) for all the treatments is

A) 7.00.
B) 6.67.
C) 7.25.
D) 4.89.