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I dont understand the question

I dont understand the question-example-1

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Answer:

8.

Explanation:

This diagram is a histogram where the areas of the rectangles give the number of fish.

For example, the number of fish in the first rectangle (that is fish whose length is 0-10) is 10 * frequency density

= 10 * 0.6 = 6 fish.

So, the number of length 30 - 40 cm

= (40-30) * 0.8

= 10*0.8

= 8.

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