Consider the following data set: -0.02 -0.05 -0.03 0.01 0.13 25th 50th percentile 75th percentile 0.12 0.12 Click here for the Excel Data File a-1. Calculate the 25th, 50th, and 75th percentiles. (Negative amounts should be indicated by a minus sign. Round your answers to 2 decimal places.) a-2. Interpret the 25th, 50th, and 75th percentiles. Approximately 25 percent of the observations have values Approximately 50 percent of the observations have values Approximately 75 percent of the observations have values (Click to select) (Click to select) (Click to select)