JEE Main 2019 Mathematics question

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 | | 2x − 5 | | x |

then the mean of the marks is:

• (A)3.0
• (B)2.8Correct
• (C)2.5
• (D)3.2