Cumulative frequency is the running total of frequencies. It can be shown on a graph by joining points. For example if frequencies are 4, 6, 3, 2, 6, 10 then their cumulative frequencies are 4, 10, 13, 15, 21 and 31 respectively.
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Calculate the gradient of the curve which will give the acceleration. Change the sign of the answer to convert acceleration into retardation.
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