JEE Main 2023 Mathematics question

The mean and variance of the marks obtained by the students in a test are 10 and 4 respectively. Later, the marks of one of the students is increased from 8 to 12. If the new mean of the marks is 10.2, then their new variance is equal to :

• (A)4.08
• (B)3.92
• (C)3.96Correct
• (D)4.04