SHC Barbers $($Q$1$ Q$7)$

Randy needs to decide where to get a haircut. He has narrowed the choice down to two local hair salons $$ Large Hair Salon $($LHS$)$ and Small Hair Cutters $($SHC$).$

A new customer walks into LHS every $15$ minutes on average, with a standard deviation of $15$ minutes. At SHC$,$ a customer walks in every hour on average, with a standard deviation of $1$ hour. LHS has a staff of $4$ barbers, while SHC has $1$ barber. The average service time at both salons is $30$ minutes, with a standard deviation of $30$ minutes.