The following table shows the number of police calls that were made last year in each of the cities in Hogdon County. City |Clarksville |Bremington |Shells |Gristle | Thornbury - | :-: | :-:| :-:| :-:| :-: **Number of police calls**| $244$| $353$ | $235$| $311$ | $\large?$ **If the mean of the data set is $273$ calls, find the number of police calls in Thornbury.** $\qquad$[[☃ numeric-input 1]] calls