Refer to the following distribution of ages:
What is the class interval?
A)10 B)5 C)9 D) 20

The class interval of the distribution of ages is 10
To determine the class interval, we simply make use of the first class limits
5 up to 15
Rewrite the first class limits as:
5 - 15
Calculate the difference between the upper and the lower limits
Class interval = 15 - 5
Evaluate the difference
Class interval = 10
Hence, the class interval of the distribution of ages is 10
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