Answer:
at intervals of 10
Step-by-step explanation:
you can use the class interval as
10 - 20
20-30
30-40
40-50
50-60
60-70
The class intervals to use for the given data is 10
The class interval is the difference between the upper class limit and the lower class limit. Class interval represents the width of each class in a frequency distribution
The frequency of a class interval is the number of observations that occur in a particular predefined interval.
From the given data the prepare a table for age and frequency
Age frequency
0-10 4
11-20 5
21-30 2
31-40 5
41-50 0
51-60 2
61-70 1
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