b] The following table shows the time spent in leasing a book by a group of standard sis ' students from Perrneta Pruner)- School. i] Construct a 'less thanr ogive for the data above. {4 martts] ii] Estimate the median value using the ogive in [i]. {3 merits] iii} Calculate the mean and the standard deviation for the data above. {5 merits] iv] Estimate the percentage of students who spent more than one hour to read a book using the ogive in {i]. {3 marks] v] The mean and variance of time to read e book by a group of students from Beriien Primer]:r School are 43.21 and 234.? respectively. Determine Iwhich group of students is more consistent in the time spent reading a book. {5 marks] FORMULA LIST Sample Measurements 1. Mean, X = 2x or n Er 2. Median, x = L + 2 C f 3. Mode, *=L+ A + A , C 4. Standard Deviation, 1 [(x - 8 )] or n-1 1 n- [If(x- 8 )] or n-1 5. Coefficient of Variation, CV = x 100 Mean - Mode 6. Pearson's Coefficient of Skewness = 3( Mean - Median ) or Standard Deviation Standard Deviationwhere n total frequency lower median class boundary lower modal class boundary cumulative frequency for the classes before the median class median class frequency (modal class frequency) - (frequency for the class before modal class) ODD (modal class frequency) - (frequency for the class after modal class) class size