The mean of marks obtained in an examination by a group of 100 students was...
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Physics
The mean of marks obtained in an examination by a group of 100 students was found to be 49 96 The mean of the marks obtained in the same examination by another group of 200 students was 52 32 Find the mean of the marks obtained by both the groups of students taken together An assesses depreciated the machinery of his factory by 10 each in the first two years and by 40
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