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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 : |
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Answer» If for some x∈R, the frequrency distribution of the marks obtained by 20 students in a test is :
then the mean of the marks is : |
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