moomoo95351 moomoo95351

31-01-2024
Mathematics

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if for some x ∈ R the frequency distribution of the marks obtained by 20 students in a test is:
Marks 2 3 5 7
Frequency (x+1)² 2x-5 x²-3x x.
then the mean of the marks is :
A. 2.5
B. 3.2
C. 3.0
D. 2.8

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