The average height of 600 students of a school is 140.75cm. With the enrolment of 40 new students the average height rises to 141.05cm. The average height of new student is
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total height of all 600 students =600*140.75= 84450
total height of 640 students = 640*141.05=89632
total height of the new 40 student = 89632-84450=5182
average height of the 40 nee students =5182/40=129.55
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