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A research study was conducted to investigate the time students spend (in minute) to do revision before each class started. The time of 25 sample students was collected a random during one tutorial session. Data are listed in Table 2(refer image). Answer the following questions using the ungrouped data formula. Table 2(refer image) (a) Calculate the mean time spend. (b) Determine the median time spend. (c) Determine the mode/modes time spend. (d) Based on your answer in (a)-(c), describe briefly the skewness of time students spend (in minute) to do revision before each class started. (e) Calculate the range of time spend. (f) Calculate the variance of time spend. (g) Calculate the standard deviation of time spend. (h) Calculate the coefficient of variation of time spend. (i) Based on your answer in (a)-(h), write a brief summary of time students spend (in minute) to do revision before each class started.