Question

which variable is numerical?
electricity provider
internet speed (mbps)
type of apartment (studio/1 - bedroom/2 - bedroom)
type of utility (gas/electric)

Explanation:

A numerical variable is one that can be measured and has a numerical value. Internet speed (Mbps) is measured in megabits per second, which is a numerical quantity. The other variables (electricity provider, type of apartment, type of utility) are categorical variables as they represent categories or labels rather than numerical measurements.

Answer:

internet speed (Mbps)