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.) 324 515 402 458 338 C 464 343 384 548 514 495 444 365 423 501 552 328 496 394 429

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