find the first quartile of 7,8,7,9,11,8,7,9,6 and 8.
- 8.5
-
7.0
- 7.5
- 8.0
The correct answer is: B
Explanation
Rearrange data in increasing order: 6,7,7,7,8,8,8,9,9 and 11
First quartile (ungrouped data) = \(\frac{n + 1}{4}\)th value
= \(\frac{11}{4}\)
= 2.75th value
= \(\frac{7 + 7}{2}\)
= 7.0