please help me in finding the ans 17
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sum of marks obtained by students / no. of students
= mean
so , given incorrect mean = 40
no. of students = 100
incorrect sum of marks obtained by students = 40*100 = 4000
since one reading 53 misread as 83 so ,
correct sum = 4000-83+53= 3970
so correct mean = correct sum / no. of students
= 3970/100 = 39.7
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