point(S) POSSIDIE A cellular phone company monitors monthly phone usage. The 339 383 517 552 368 following data represent the monthly phone use in minutes of one 494 519 357 389 454 particular customer for the past 20 months. Use the given data to 450 349 335 462 418 answer parts (a) and (b). 438 484 363 387 559 Learn mo (a) Determine the standard deviation and interquartile range of the data (Round to two decimal places as needed.) IQR - (Type an integer or a decimal.) (b) Suppose the month in which the customer used 339 minutes was not actually that customer's phone. That