Mathematics
If the mean of the observations x1, x2, x3, ……, xn is x̄, then the mean of x1 − a, x2 − a, x3 − a, ……, xn − a is : 1. 2. + a 3. − a 4.
Related Questions
The mean of 5 consecutive odd numbers of set A is 37. What will be the average of set B containing four consecutive even numbers if the smallest number of set B is 13 more than the greatest number of set A?
53
55
57
59
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