Given below is an example of random number table.Example: The table of ten random numbers of two digits each is provided to the field investigator.
How should he use the below table to make a random selection of 5 plots out of 40?
34 
96 
61 
85

49 
78 
50 
02 
27 
13 
Solution: In this case we shall first identify the 40 plots with the numbers 1 to 40. In the given problem there are only three numbers less than 40 i.e., 02, 13 and 34, so we will not be able to draw the desired sample of size 5 from this table.
Hence we assign more than one number to each of the sampling units (plots).
01, 01 + 1 * 40, 01 + 2 * 40, 01 + 3 * 40, ........ and so on
i.e., 1, 41, 81, 121, 161, 201, ...... and so on
Similarly the second plot will be assigned the numbers
02, 02 + 1 * 40, 02 + 2 * 40, 02 + 3 * 40, ..........
02, 42, 82, 122, 162, 202, .........., and so on
Finally the last plot can be assigned the numbers 0, 40, 80, 120, 160, ..... and so on.
Select the first number in the given problem and move row wise we get,
Number from table

Number of the sampled plot

34 
34 
96 = 16 + 2 * 40

16 
61 = 21 + 40

21 
85 = 5 + 2 * 40

5 
49 = 9 + 40 
9 
Thus the plot numbers 5, 9, 16, 21 and 34 constitute the desired sample.
If we select the first number from the given problem and move column wise the desired sample consists of plot numbers :
34, 38, 16, 10 and 21
Because, 78 = 40 + 38
96 = 2 * 40 + 16,
50 = 40 + 10
and 61 = 40 + 21.