The Marseille Water Taxi ferries tourists from the harbor at Marseille, France, to the Frioul Islands in the Mediterranean Sea. The data in the attached spreadsheet shows the number of passengers on the noontime ferry over seven randomly selected days along with the current ambient temperature in degrees.
Predict the number of passengers on the ferry when the temperature is 19 degrees Celcius.

Temperature Passengers
16 15
19 20
22 20
26 22
18 10
24 18