An $\bar { x }$ Control Chart Is Constructed Using 25 Samples of Size 3

Short Answer

An $\bar { x }$ control chart is constructed using 25 samples of size 3 each, when the process is in-control and the random variable of interest is normally distributed with a mean of 20 and standard deviation of 1.732. Then, the 3 standard deviation control limits are LCL = __________ and UCL =__________.