Cumulative frequency
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The average or mean. NOT the median.
It is the average or arithmetic mean.
mean = (sum of data items)/(number of data items) = (40,000 + 90,000 + 40,000 + 30,000 + 80,000)/5 = 280,000/5 = 56,000
the average
It is the mean average of number of collected data values.