A cellular phone company monitors monthly phone usage. The following data 333 414 548 498 393 represent the monthly phone use in minutes of one particular customer for 334 464 371 553 421 the past 20 months. Use the given data to answer parts (a) and (b). 363 436 494 463 542 490 403 340 444 452 (a) Determine the standard deviation and interquartile range of the data. S= (Round to two decimal places as needed.)