As per the following graph, number of students having their birthday in December is .

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Solution

The scale of the vertical axis has an interval of 2 units.

Hence, the distance between two horizontal lines is two units.

From the graph, it is observed that the peak of bar corresponding to December lies midway between 6 and 8 units.

Hence, the bar has a height of 7 unit.

$∴$ 7 student has his/her birthday in December.

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