The following data represent the monthly phone use, in minutes, of a customer enrolled in a fraud prevention program for the past 20 months. The phone company decides to use the upper fence as the cutoff point for the number of minutes at which the customer should be contacted. What is the cutoff point? 381 352 542 383 302 540 335 444 471 455 431 483 427 486 502 313 417 509 421 312 The cutoff point is minutes. Round to the nearest minute.)

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