JEE Math Practice Question
If for some x $$ \in $$ R, the frequency distribution of the marks obtained by 20 students in a test is : .tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} .tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} .tg .tg-s6z2{text-align:center} .tg .tg-baqh{text-align:center;vertical-align:top} .tg .tg-hgcj{font-weight:bold;text-align:center} Marks 2 3 5 7 Frequency (x + 1)2 2x - 5 x2 - 3x x then the mean of the marks is
- A.3.0
- B.2.8
- C.2.5
- D.3.2
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