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What is the range of the following marks obtained by 15 students in a history test of class VI in a school?
9, 17, 12, 20, 9, 18, 25, 17, 19, 9, 12, 9, 12, 18, 17

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answer is B.

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Detailed Solution

The given data is:

9, 17, 12, 20, 9, 18, 25, 17, 19, 9, 12, 9, 12, 18, 17

The ascending order of the data is:

9, 9, 9, 9, 12, 12, 12, 17, 17, 17, 18, 18, 19, 20, 25

We know the range is calculated by subtracting the lowest value from the highest value.

Therefore, range = Highest marks – Lowest marks = 25 – 9 = 16

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