If for some x R, the frequency distribution of the marks obtained by 20 students in a…

Mathematics · JEE Main · NTA ExamsStatistics and Probability

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

  1. 3.0
  2. 2.8
  3. 2.5
  4. 3.2

Answer

(B) 2.8

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