Answer:
The median is the middle number in a set of given numbers.
In this case, the numbers range from 70 to 115
To find the median we must do the following:
115-70 = 45cm
45cm x 2 = 90cm
Median Waist Measurement = 90cm
IQR (Interquartile Range):
The IQR is the spread of the middle half of the data.
If the middle is 90cm, then halfway on either side is the IQR
90-70 = 20 gap between lower IQR and middle
halfway is 10
Lower IQR = 80cm
Same applies for higher IQR:
115-90 = 25
halfway is middle + 12.5
90+12.5 = 102.5
Interquartile Range is
80cm to 102.5cm