Page 211 - Maths Skills - 7

Data Handling 209

MIND MAP

Data Handling

Measures of Central Tendency
“A measure of central tendency is the single value that attempts to describe
a set of data by identifying the central position within the set of data”.

Mean Mode
“It is the number that shows the central “It is the observation that occurs most
location of a group of observation”. number of times in a given data”.
Sum of all observations
Mean =
Total number of observations

Range = Highest observation – Lowest observation

Mean lies in between the greatest
and smallest observation.

Median
“It is the middle most value of a given data”.

th PRIMARY DATA
 n+1 
Median =  2  term It is collected from
  primary source and
where, n (number of observations) odd number also called as raw data.

 n  th term +  n +1  th term
   2 
Median =  2  2   SECONDARY DATA

where, n (number of observations) even number It is collected from secondary
source like news, newspaper
T.V. etc.