Given the Following Range Readings for 25 Subgroups of Size

Short Answer

Given the following range readings for 25 subgroups of size four, determine the process capability. $\begin{array}{cc}\text { Subgroup } & \text { R } \\1 & 3.2 \\2 & 3.8 \\3 & 3.6\\⋅&⋅\square\\⋅&⋅\square\\⋅&⋅\\24 & 3.6 \\25 & 3.4\\&\square=90.0\end{array}$