JEE Main 2021 Mathematics question
Let the mean and variance of the frequency distribution x: =2, =6, =8, =9 f: 4, 4, , be 6 and 6.8 respectively. If is changed from 8 to 7, then the mean for the new will be :
Answer: (C)
Let the mean and variance of the frequency distribution x: =2, =6, =8, =9 f: 4, 4, , be 6 and 6.8 respectively. If is changed from 8 to 7, then the mean for the new will be :