Key datastructure is a data statucture or container which keeps
key value pair. For a search the key is passed to check that the
key is present in DS or not.
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No. The COUNT function counts only numeric values, including
dates and times. It will not count cells with text or logical data
or blank cells. COUNTA will count all kinds of data.
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By using the basic definition of a quartile. Sort the data,
count how many there are in total, then count off one quarter of
that. For example, if you have 80 data items, count off the first
20 items (after sorting).