Question

Shown below are the top 15 market research firms in the United States in 2010 according to Inside Research. Compute the mean, median, P35, P40, P55, 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 =

P35 =

P40 =

P55 =

Q1 =

Q3 =

Range =

Interquartile range =

Answer 1