A cellular phone company monitors monthly phone usage. The following data represent the monthly phone use in minutes of one particular customer for the past 20 months. Use the given data to answer parts (a) and (b). (a) Determine the standard deviation and interquartile range of the data. S= (Round to two decimal places as needed.) EXE 334 384 419 348 421 411 428 354 343 344 401 320 503 479 380 498 393 490 554 445

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