The testing times for a group of college students were normally distributed with a mean of / -39 minutes and a standard deviation of o -2.1 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. H = 39 o - 2.1 H- 30 4-20 u-0 H u+O H+ 20 H+30 Used the Empirical Rule to complete the following statements: 68% of testing times were between minutes and minutes. 95% of testing times were between minutes and minutes. 99.7% of testing times were between minutes and minutes. 50% of testing times were below minutes