Calculate the demand forecast per week $($in hours$)$ and the demand CV for a production manager who is expected to work $50$ hours per week. Each week, the manager: $($a$)$ attends $10$ daily meetings that each average $80$ minutes each with a CV of $35\%,($b$)$ troubleshoots $21$ problems that each averages $43$ minutes each with a CV of $45\%$; $($c$)$ creates next week$$s schedule that averages $5\mathrm{.}4$ hours minutes each with a CV of $20\%,$ and $($d$)$ works on $2$ projects with product design that each average $1\mathrm{.}75$ hours with a CV of $50\%$