The table below shows the lengths of 40 babies at birth. To calculate the cumulative frequencies, add the frequencies together. A cumulative frequency diagram is drawn by plotting the upper class ...
Notice: five groups, all of the same width. There are no gaps – every length from 30 to 55 can be recorded. There are no overlaps between the groups – eg the inequality symbols show that exactly 35 cm ...
In the renewable energies era, grid frequency will be an increasingly important indicator of stability of power supply. An interdisciplinary research consortium has analyzed frequency fluctuations in ...
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