Mean and Variance Update After Mark Change (Jee… | ExamDuo
Dispersion and Variance
Medium
Mean and Variance Update After Mark Change
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: