Mathematics
The mean of a certain number of observations is x̄. If each observation is multiplied by m (m ≠ 0) and then increased by n, then the mean of new observations is : 1. 2. m + n 3. m − n 4.
Related Questions
If the mean of four observations is 20 and when a constant c is added to each observation the mean becomes 22. The value of c is :
−2
2
4
6
The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is :
40
49.9
50
50.1
If the mean of the following data is 25, the value of p is equal to :
x f 5 3 15 p 25 3 35 6 45 2 2
3
4
5