In a Completely Randomized Design Involving Four Treatments, the Following

Multiple Choice

In a completely randomized design involving four treatments, the following information is provided. $$\begin{array}{ l cccc } &\text { Treatment } 1 &\text { Treatment } 2&\text { Treatment } 3& \text { Treatment } 4\\\text { Sample Size } & 50 & 18 & 15 & 17 \\\text { Sample Mean } & 32 & 38 & 42 & 48\end{array}$$
The overall mean (the grand mean) for all treatments is

A) 40.0.
B) 37.3.
C) 48.3.
D) 37.0.