Frequency density = frequency / class width

This type of question, asked 2 times: CDS 2 2016, CDS 2 2017. All 2 questions below, oldest first.

Try each one first, then open its answer.

Question 1
CDS 2 2016
95 $Suppose the class interval 10-15 has frequency 30, then what is the frequency density of this class interval ?$
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Question 2
CDS 2 2017
91 $Frequency density of a class is computed by the ratio$
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