Steel factory workers ages mean: 42 median: 38 range: 52 mean deviation: 11.23 shift 1 18 25 56 42 29 38 54 47 35 30 shift 2 23 19 50 49 67 34 30 59 40 33 shift 3 19 22 24 40 45 29 33 29 39 59 shift 4 21 23 25 40 35 19 70 40 22 23 the summary statistics for all of the workers at a steel factory are shown. four sample groups were taken from each of the four shifts. for which sample group is the mean closest to the population mean? a) shift 1 b) shift 2 c) shift 3 d) shift 4