Eg. : Find the median : 12, 54, 13, 47, 38
In ascending order : 12, 13, 38, 47, 54
Here n = 5, odd.
Therefore, median = n 21 item^521 item^62 item^3 rd^ item^38
th th th
⎛⎝⎜ + ⎞⎠⎟ =⎜⎛⎝ + ⎞⎠⎟ =⎛⎜⎝ ⎞⎠⎟ = =
- Mode
Mode is the value which occurs most frequently in a data. To find the mode in a given
data, it is just enough to identify the value which occurs the most number of times.
If no number occurs more than once then there is no mode. If more than one value
occurs the same number of times in a data, then all such numbers become the modes.
To enable the child with visual impairment to understand the concept, explain the
idea verbally and then provide the child with a set of articles which contain a particular
object more than once, say thrice. Then, that particular object becomes the mode
among the set of articles chosen.
Eg. : Find the mode : 2, 5, 7, 8, 2, 3, 4, 6, 2, 10
Here 2 occurs thrice and hence 2 is the mode.
- Measures of Dispersion
The measures of dispersion help in finding out the extent of dispersion of the
observations in the data. The commonly used measures of dispersion are the range,
standard deviation and the variance.
- Range
The range is the difference between the maximum value and the minimum value in a
given data.
Therefore, Range = Maximum value - Minimum value
Range is also called the spread.
