Question

Find the upper quartile for the following data set:7,9,13,4,18,3,9,10,15,8,2,6,9A. 7.5B. 6.5C. 9D. 5E. 11.5

Answer 1

Recall that the upper quartile, or third quartile, is the value under which 75% of data points are found when arranged in increasing order.

Therefore, to determine the third quartile, we have to order the given data from lowest to highest:

`2,3,4,6,7,8,9,9,9,10,13,15,18.`

Therefore:

`Q_3=(10+13)/(2)=(23)/(2)=11.5.`

Answer: Option E.