Mode of a group of observations

MEDIAN Median of a group of observations is the value of the variable which divides the group into two equal parts.

The arithmetic mean , the mode and the median of a group of 75 observations were calculate to be 27, 34 and 29 respectively. It was later discovered that one observation was wrongly read as 43 instead of the correct value 53. Examine to what extent the calculate values of the averages will be affected by the error.

MODE Mode of a set of observations is the value of the observation that occurs most frequently.

The mean of a group of 100 observation was found to be 20. Latter it was found that four observation were incorrect, which were recorded as 21, 21, 18 and 20. What is the mean if the incorrect observation are obtained?

Out of 250 observations, the first 100 observations have mean 5 and the average of the remaining 150 observations is 25/3 What is the average of the whole group of observations ?

A group of 10 observations has mean 5 and 2sqrt(6) another group of 20 observationshas mean 5 and S.D.3sqrt(2) ,then the S.D.ofcombined group of 30 observations is

The median of 19 observations of a group is 30. If two observations with values 8 and 32 are further included,then the median of thenew group of 21 observation will be