Mathematics
If each observation of the data is increased by 5, then their mean
remains the same
becomes 5 times the original mean
is decreased by 5
is increased by 5
Related Questions
The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is
28
30
35
38
If the mean of x1, x2 is 7.5, and the mean of x1, x2, x3 is 8, then the value of x3 is
9
8
7.5
6
The mean of 100 observations is 50. If one of the observation which was 50 is replaced by 150, the resulting mean will be
50.5
51
51.5
52
For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively :
upper limits of the classes
lower limits of the classes
class marks of the classes
upper limits of preceding classes