In order to improve the production time, the supervisor of assembly lines in a manufactu...

In order to improve the production time, the supervisor of assembly lines in a manufacturing setting of cellular phones has studied the time that it takes to assemble certain parts of a phone at various stations. She measures the time that it takes to assemble a specific part by 165 people at different shifts and on different days. The record of her study is organized and shown in the accompanying table.

Plot the data and calculate the mean and standard deviation.