What is the variance for the Driver_Height variable in the UPS group?

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Delivery_data.RData

Company Box_Weight Driver_Height Driver_Salary 1 UPS 14.3 63 45144 2 UPS 16.8 65 44986 3 UPS 14.0 63 45798 4 UPS 17.8 59 44581 5 UPS 13.5 66 44912 6 UPS 13.3 64 44809 7 UPS 11.7 69 44989 8 UPS 18.4 64 45348 9 UPS 19.4 64 44639 10 UPS 21.7 64 44908 11 UPS 18.8 69 45491 12 UPS 15.8 69 45202 13 UPS 15.1 70 44715 14 UPS 14.1 65 45244 15 UPS 21.2 63 45192 16 UPS 18.9 63 44231 17 UPS 16.1 65 44988 18 UPS 11.9 65 44906 19 UPS 11.7 65 45294 20 UPS 14.2 68 45095 21 FEDEX 15.3 68 55104 22 FEDEX 16.8 66 54985 23 FEDEX 13.3 68 54958 24 FEDEX 18.4 68 54199 25 FEDEX 13.5 68 55181 26 FEDEX 14.7 71 54604 27 FEDEX 17.0 73 55222 28 FEDEX 18.9 75 55587 29 FEDEX 13.4 68 54914 30 FEDEX 13.5 68 55307 31 FEDEX 11.0 70 54683 32 FEDEX 21.6 67 54782 33 FEDEX 16.4 70 54933 34 FEDEX 12.6 70 54537 35 FEDEX 15.0 67 54169 36 FEDEX 17.6 72 54912 37 FEDEX 15.0 68 54964 38 FEDEX 16.9 69 54909 39 FEDEX 13.9 67 54996 40 FEDEX 16.3 71 54836 41 DSL 17.7 74 35086 42 DSL 18.3 66 35170 43 DSL 18.6 72 35600 44 DSL 17.6 69 35087 45 DSL 15.7 66 35204 46 DSL 16.5 71 35062 47 DSL 19.5 68 34711 48 DSL 15.4 68 34934 49 DSL 20.0 67 34901 50 DSL 13.3 73 35369 51 DSL 13.4 71 34698 52 DSL 15.0 67 34439 53 DSL 18.4 73 34523 54 DSL 12.2 77 34648 55 DSL 13.4 72 35030 56 DSL 13.8 67 35247 57 DSL 14.4 69 35174 58 DSL 18.6 68 34943 59 DSL 14.0 67 34450 60 DSL 13.1 69 35165