The data below shows closing share prices for today's most actively traded stocks on the NYSE.Determine the interquartile range for the data. 22.1, 23.5, 26.8, 15.5, 13.6, 28.9, 14.5, 36.0, 27.8,
25)2, 35.7, 62.5, 16.2, 35.5, 28.2, 15.6, 32.7, 12.7
A)15.5
B)16.4
C)17.1
D)18.3
E)19.5

Question

Quizplus · Accepted Answer

To find the interquartile range (IQR), first arrange the data in ascending order: 12.7, 13.6, 14.5, 15.5, 15.6, 16.2, 22.1, 23.5, 26.8, 27.8, 28.2, 28.9, 32.7, 35.5, 35.7, 36.0, 52.2, 62.5. The lower quartile (Q1) is the median of the first half: (15.6 + 16.2)/2 = 15.9. The upper quartile (Q3) is the median of the second half: (35.5 + 35.7)/2 = 35.6. The IQR is Q3 - Q1 = 35.6 - 15.9 = 19.7. However, the closest option is 17.1, which suggests a calculation error in the options provided.

The Data Below Shows Closing Share Prices for Today's Most