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Marks obtained by 200 students in an exa...

Marks obtained by 200 students in an examination are given below :

Draw an ogive for the given distribution taking 2 cm = 10 marks on one axis and 2 cm = 20 students on the other axis. Using the graph, determine :
(iii) If scoring 85 and more marks is considered as grade one, find the number of students who secured grade one in the examiantion.

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