Math, asked by kj1504, 3 days ago

1000 students appeared in an examination. They are grouped in three classes I, II, and III according to their marks. The minimum and maximum marks required for second class are 50 and 60 respectively. If 50 students secured first class and 350 secured second class, prove that the average marks of the group is 48.2 and S.D. is 7.14 (Assume that the marks are normally distributed).

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Answered by mallelacharankumar

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