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=75.93 (Round to two decimal places as needed.) IQR (Type an integer or a decimal.) 320 453 558 322 439 560 542 442 393 495 462 343 360 386 472 532 490 384 396 410