Correct Answer: Option B

Explanation

Rearrange data in increasing order: 6,7,7,7,8,8,8,9,9 and 11

First quartile (ungrouped data) = \(\frac{n}{4}\)th value

= \(\frac{10}{4}\) 

= 2.5th value

= \(\frac{7 + 7}{2}\)

= 7.0

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