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Sometimes we have to estimate the interquartile range from a cumulative frequency diagram. It is acceptable when dealing with an even total cumulative frequency to use LQ = \(\frac{n}{4}\) ...
Sampling data - Intermediate & Higher tier - WJEC Cumulative frequency – Intermediate & Higher tier - WJEC Averages and range - WJEC Discussing results - WJEC Mean, median and mode ...
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