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:

[JEE Main 2023, 25 Jan (Shift 1)]

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:

[JEE Main 2023, 25 Jan (Shift 1)]

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The mean and variance of the marks obtained by the students in a test are 10 and 4 respectively. Later, the marks of one…

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