21. A late 19th century gang of outlaws has a sharpshooting contest over a course of six days at Horseshoe Overlook. On each day, participants were challenged to shoot as many empty beer bottles as they could in 30 seconds. Calculate the standard deviation for each gang member using the raw score formula and write a sentence of interpretation describing who is the most consistent in their shooting. Which type of standard deviation should be calculated? Treat this as population data. (4 points). Lenny Arthur Micah John 13 12 9 15 5 15 13 11 11 11 12 9 10 15 9 13 13 10 14 10 8 9 9 8 Lenny SD Arthur SD Micah SD John SD Type of SD that should be calculated (use correct symbol). Interpretation: