1.

If for some x∈R, the frequrency distribution of the marks obtained by 20 students in a test is :Marks2357Frequency(x+1)2 2x−5x2−3xxthen the mean of the marks is :

Answer»

If for some xR, the frequrency distribution of the marks obtained by 20 students in a test is :


















Marks2357
Frequency(x+1)2 2x5x23xx



then the mean of the marks is :


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