Question 5 - A-Level Maths

Exam Board	CAIE
Module	S1 (Statistics 1)
Year	2012
Session	June
Topic	Measures of Location and Spread
Type	Construct back-to-back stem-and-leaf from raw data

5 The lengths of the diagonals in metres of the 9 most popular flat screen TVs and the 9 most popular conventional TVs are shown below.

Flat screen :	0.85	0.94	0.91	0.96	1.04	0.89	1.07	0.92	0.76
Conventional :	0.69	0.65	0.85	0.77	0.74	0.67	0.71	0.86	0.75

Represent this information on a back-to-back stem-and-leaf diagram.
Find the median and the interquartile range of the lengths of the diagonals of the 9 conventional TVs.
Find the mean and standard deviation of the lengths of the diagonals of the 9 flat screen TVs.