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A mathematics teacher wants to see, whet...

A mathematics teacher wants to see, whether the new technique of teaching she applied after quarterly test was effective or not. She takes the scores of the `5` weakest children in the quarterly test (out of `25`) and in the half yearly test (out of `25`):

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She draws the adjoining double
bar graph and finds a markedimprovement in most of the
students, the teacher decidesthat she should continue to use
the new technique of teaching.
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