The following table provides product survey results for the reliability rating of four mobile phone brands. A value of 0 represents completely unreliable and a value of 100 indicates completely reliable. Using the data in the table answer the following questions. Reliability Scores for Mobile Phone Brands Brand A Brand B Brand C Brand D 77 85 50 50 65 89 39 89 79 46 95 57 45 75 68 54 83 81 33 60 68 78 37 69 65 61 72 82 43 74 73 62 53 56 70 92 66 63 30 64 (a) Compute the mean, median, first quartile, and third quartile for each brand. Use the exact position, (n+1)f, where n is the number of observations and f is the relevant fraction for the quartile. 1 mark (b) Calulate the standard deviation, range and coefficient of variation from the data for each brand. 1 mark (c) Draw a box and whisker plot for the reliability of each brand and put them side by side on the same scale so that the reliability of the phones can be compared. 1 mark (d) Compare the box plots and comment on the distribution of the data. 1 mark