The video teaches how to construct cumulative frequency table and in turn use it to draw cumulative frequency curve. Reading median, upper quartile, lower quartile from the curve and calculating semi-interquartile range are also treated. Enjoy and remember to subscribe to my channel https://www.youtube.com/channel/UCMPwUBfQerqVwHO_TiKjuxg. Like our Facebook page https://www.facebook.com/Oninabresources