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: Treatment 1
$\begin{array} { l } & \text {Treatment 1 }& \text {Treatment 2 }& \text {Treatment 3 }\\\hline \text {Sample size }&5&10&5\\\text { Sample mean }&4&8&9\\\end{array}$

?
The overall mean for all the treatments is ______.

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