The following table gives the cumulative distribution of age in years for 23 children Interval F rf 1-3 2 4-6 9 7-10 15 11-13 15 14-20 23 Total 1- Calculate the relative frequency of the factories number, and fill it in the above table. 2- Construct an ogive for the given data 3- Use the ogive to estimate the P of the children age distribution, and interpret the obtained value (من الرسم السابق) 4- Estimate the followings and indicate the units ( a) mean, III b) Mode