Which number is missing from each of the following sequences:
a) 20, 30,40,…,60
Categories
Value
Category
1
3
5
10
20
30
35
40
41
45
50
55
58
60
70
90
98
509
998
DK
99999999
Missing
Sysmiss
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.