Question

Shown below are the top 15 market research firms in the United States in 2010 according to Inside Research. Compute the mean, median, P₄₅, P₄₀, P₆₅, Q₁, Q₃, range, and the interquartile range on these data.

Company	Sales ($ millions)
The Nielsen Co.	$2,407.0
Kantar	914.7
IMS Health Inc.	801.0
SymphonyIRI Group	457.0
Westat Inc.	455.3
Arbitron Inc.	390.4
Ipsos	379.6
GfK USA	290.9
Synovate	235.8
The NPD Group Inc.	173.7
ICF International Inc.	153.2
J.D. Power and Associates	147.3
comScore Inc.	142.0
Maritz Research	140.9
dunnhumbyUSA LLC	110.7

(Round your answer to 2 decimal places.)

Mean =

Median =

P₄₅ =

P₄₀ =

P₆₅ =

Q₁ =

Q₃ =

Range =

Interquartile range =

Answer 1

Summary Stats

Mean	457.77
Median	290.90
P45	252.33
P40	210.96
P65	396.89
Q1	150.25
Q3	456.15
Range	110.7 to 2074.00
Interquartile Range	305.90