The manager of Jill$$s Lawncare decides to better control the process of her crews by determining the process

capability, and charting the duration $($in minutes$)$ of $5$ lawn mowing jobs performed each day in a condominium

development. Assume that each lawn is an identical size and configuration. During peak times, her $10$ crews each average $10$

lawns per day.

part A If the specification for the lawn mowing time is $40$ minutes $\backslash$pm $15$ minutes, what is the C pk of this process? $($Please

use grand mean and its standard deviation$)$