BalanceGig is a company that matches independent workers for short-term engagements with businesses in the construction, automotive, and high-tech industries. The 'gig' employees work only for a short period of time, often on a particular project. A manager at BalanceGig extracts the employee data from their most recent work engagement, including the hourly wage (HourlyWage), the client's industry (Industry), and the employee's job satisfaction (Job). The manager suspects that data about the gig employees are sometimes incomplete, perhaps due to the short engagement and transient nature of the employees. She would like to find the number of missing observations