A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results Machine #$1$ #$2$ #$3171623$ Measurements $152524151823$ What is the sample mean for machine #$1?172522$ A quality analyst wants to construct a control chart for determining whether three mochines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results What is the sample mean for machine $\backslash (\backslash$# $1\backslash )?$