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). 325 433 402 347 416 478 380 333 445 409 531 550 410 406 336 (a) Determine the standard deviation and interquartile range of the data. S= (Round to two decimal places as needed.) 431 476 524 546 394 IQR = (Type an integer or a decimal.) (b) Suppose the month in which the customer used 325 minutes was not actually that customer's phone. That particular month the customer did not use their phone at all, so 0 minutes were used. How does changing the observation from 325 to 0 affect the standard deviatich and interquartile range? What property does this illustrate? The standard deviation and the interquartile range What property does this illustrate? Choose the correct answer below. Empirical Rule