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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

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). (3) Determine the standard deviation and interquartile range of the data. s = Cl (Round to two decimal places as needed.) 338 441 342 429 529 526 354 476 493 454 328 421 425 320 474 432 426 % 472 555 389

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