Answer
Minimum = 147
Maximum = 632
Median = 273
Q1 = 156
Q1 = 543
IQR = 387
Work Step by Step
Arranging the values in ascending order, we have:
Minimum = 147
Maximum = 632
Median is the average of middle values = (243+303)/2 = 273
$Q_{1}$ is the median of values below median or at 25% of values, hence:
$Q_{1}$ = 156
$Q_{3}$ is the median of values above median or at 75% of values, hence:
$Q_{3}$ = 543
IQR = $Q_{3} - Q_{1} = 543-156 = 387$
