In a hearing test,subjects estimate the loudness (in decibels)of sound,and the results are;68,67,70,71,68,75,68,62,80,73,68 What is the first quartile?
A)73
B)68
C)70.5
D)67
E)75

Question

Quizplus · Accepted Answer

To find the first quartile, we need to arrange the data in ascending order. After doing so, we get: 62, 67, 68, 68, 68, 70, 71, 73, 75, 80. The first quartile, denoted as Q1, is the median of the lower half of the data set. Since there are 10 data points, the median of the lower half will be the average of the two middle data points. Those data points are 62 and 67, so Q1 = (62+67)/2 = 64.5. The closest answer choice to 64.5 is B, 68.

In a Hearing Test,subjects Estimate the Loudness (In Decibels)of Sound,and