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= IQR = (Round to two decimal places as needed.) (Type an integer or a decimal.) (b) Suppose the month in which the customer used 321 minutes was not actually that customer's phone. That particular month the customer minutes were used. How does changing the observation from 321 to 0 affect the standard deviation and interquartile range? What property d The standard deviation (1)- and the interquartile range (2). What property does this illustrate? Choose the correct answer below. 0000 Resistance Dispersion Empirical Rule Weighted Mean (1) is not affected decreases increases (2) increases. is not affected. decreases.