PROBLEM $3.$

Marble Inc. makes countertops from a variety of high$-$end materials. To monitor the quality of its production processes, the company randomly selects one countertop and counts the number of blemishes. The results for ten samples are shown below:

Sample $No.1,2,3,4,5,6,7,8,9,10$

$No.of$ Blemishes $17,19,15,18,16,14,15,16,15,15$

Using $+-3$ limits$,$ calculate the LCL and UCL for these data. Is the process under control? Mark the correct answer