4, Please compute and fill the following table. Then answer the following questions (a-h). (Must Use D-Method to get full credits) Age (in years) Frequency Mid-point (X) Cf d df d2 d2f 20 - 24 10 25 - 29 19 -2 30 - 34 27 -1 35 - 39 16 0 40 - 44 10 1 45 - 49 6 50 - 54 5 55 - 59 3 A W N Total a) Mean b) Median c) Mode d) Range e) Variance f) Standard deviation g) 45th Percentile h) 1st Quartile