Lower limit= Q₁-1.5xIQR Upper limit= Q3 +1.5xIQR IQR = Q3 - Q₁
The manager of a local fast-food chain wants to improve the service provided to customers who use the drive-up
window. As a first step in this process, the manager records how long it takes from the time the customer first
enters the drive-in window until they are served their food at the final window. Below are the times (in minutes) fo
the 30 customers (in order):
2 2 3 4 4 6 8 9 10 10 10 10 10 11 11
13 13 13 13 14 14 14 15 18 18 20 20 23 37 41
(a) Calculate the median.


(b) Calculate the first and third quartile.
QI=
Q3=

(c) Calculate the interquartile range.
IQR=
Lower=

(d) Calculate the lower and upper limits.
Upper=