Please note there is an error in this video at 10:30 - the line drawn should go all the way to the curve and not stop at 60, so the correct answer should be 67 years.
This video works through seveal GCSE_IGCSE exam questions on estimating the mean from a grouped frequency table, calculating cumulative frequency and drawing cumulative frequency curves. More at http://www.mathsaurus.com.
Tagged under: IGCSE,GCSE,maths,mathematics,statistics,frequency,cumulative,cumulative frequency curve
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