Read the following graph and answer the questions below
The diagram below shows the enrolment of students in a school in different years, from 2014 to 2017.
In the year 2014,2015,2016 & 2017 number of students was 200,400,250 & 450 respectively.
So, average number of students was
$$=(200+400+250+450)/4=325.$$
So,D is correct choice.
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