The following data represent the monthly phone use, in minutes, of a customer enrolled in a fraud prevention 443 465 317 430 program for the past 20 months. The phone company decides to use the upper fence as the cutoff point for the 473 461 506 455 number of minutes at which the customer should be contacted. What is the cutoff point? 331 478 313 526 347 310 434 314 367 547 543 412 The cutoff point is minutes. (Round to the nearest minute.)