12 - Outliers and Modified Boxplots LEARNING OBJECTIVE: Calculate the value of an outlier by using the 1.5XIQR rule. O Using the number of minutes per call in last month's cell phone bill, Alex calculated the upper quartile to be 24 minutes and the lower quartile to be 10 minutes. Any value greater than minutes is an outlier. O a.) 38 O b.) 34 fo O c.) 24 O d.) 45