Please do step by step explanation on how to get the range, variance, standard deviation and the coefficient of variation

6. The following is the recorded gas consumption of 30 service vehicles of a courier company. (liters/month) 267 101 46 67 92 238 175 48 81 97 122 204 63 75 91 88 119 217 281 248 64 71 92 105 78 91 241 170 187 200 Compute for a) Range b) Variance c) Standard deviation d) Coefficient of variation 7. In providing proper medical care to patients, the community hospital must consider some important information regarding the patients. One of this information is the response to the medication given to them. The following were the data obtained pertaining the responses of 25 patients to the newly BFAD- approved drug available in the market. (rate of healing) 0.48 0.73 0.39 0.82 0.65 0.78 0.63 0.49 0.19 0.28 0.81 0.67 0.47 0.36 0.15 0.67 0.54 0.81 0.90 0.24 0.41 0.58 0.61 0.73 0.18 Compute for e) Range f) Variance g) Standard deviation h) Coefficient of variation