Granite Inc. makes countertops from a variety of low$-$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 five samples are shown below.

Given the information, the upper control limit $($UCL$)$ using sigma $=3$ for this process would be

Granite Inc. Data

Sample No$.$

No$.$ of Blemishes

$1$

$30$

$2$

$45$

$3$

$52$

$4$

$25$

$5$

$28$

$18$

$$ None of these alternatives is correct.

$54$

$36$