1.

There are 60 students in a class. The following is the frequency distribution of the marks obtained by the students in a testMarksFrequency0x−21x2x23(x+1)242x5x+1Where x is positive integer. Then the variance of the marks is

Answer»

There are 60 students in a class. The following is the frequency distribution of the marks obtained by the students in a test



MarksFrequency0x21x2x23(x+1)242x5x+1



Where x is positive integer. Then the variance of the marks is



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