Question 1 The following are the scores obtain by 11 students in a test 12 14 14 1 10 26 17 33 17 a) Find first quartile , median and third quartile b) Find range and interquartile range Question 2 The speeds to the nearest miles per hour, of 120 vehicles passing a check point were recorded and are grouped in the table below : Speed (mph ) 21 - 25 26 - 30 31 - 35 36 - 40 41 - 45 Number of vehicles 22 25 16 9 a) Estimate the mean and variance of this distribution b) What is the modal class and class median ? c) Find the range. Question 3 The mean for the number of pages of a sample of women's fitness magazines is 132 . with a variance of 23 : the mean for the number of advertisements of a sample of women's fitness magazines is 182 , with a variance of 62 . Compare the variations of these two samples