QUESTION 1 A computer company is trying to increase its sales and is planning to run a new marketing campaign. To be able to set a new target for sales they have decided to use the data of the last 30 months. The number of sales for the last 30 months is as follows: 22 41 43 2b 58 4d 25 33 55 47 38 46 51 39 49 56 45 A5 67 31 43 57 41 35 53 44 24 37 43 7c By using this data set, please calculate; a) Mean of the data. b) Variance of the data. c) Standard deviation of the data. d) Make a comment on the standard deviation with regards to the mean of the data. ((Use the values for the variables (a), (b), (c) and (d) that are provided for you, for example if you have been given a=5 b=4 c=8 and d=7, then the values in yellow boxes are 58, 34, 48 and 67 respectively)