The Daytona 500 is a 500 -mile automobile race held annually at the Daytona Inte

Question

The Daytona 500 is a 500 -mile automobile race held annually at the Daytona International Speedway in Daytona Beach, Florida. The following crosstabulation shows the automobile make by average speed of the 25 winners from 1988 to 2012 (The 2013 World Almanac).

a. Compute the row percentages. If required, round your answers to two decimal places. If your answer is zero enter "0".

b. What percentage of winners driving a Chevrolet won with an average speed of at least 150 miles per hour?
  

c. Compute the column percentages. If required, round your answers to two decimal places. If your answer is zero enter "0".

d. What percentage of winning average speeds 160-169.9 miles per hour were Chevrolets?
  

Average Miles per Hour Make 130-139.9 140-149.9 150-159.9 160-169.9 170-179.9 Total Buick Chevrolet Dodge Ford

Explanation / Answer

dividing each cell with their row total values;

b)  percentage of winners driving a Chevrolet won with an average speed of at least 150 miles per hour

=(25+18.75+6.25)% =50%

c)

dividing each cell in original table by column total values

d)

  percentage of winning average speeds 160-169.9 miles per hour were Chevrolets =75%

make 130-139.9 140-149.5 150-159.5 160-169.5 170-179.5 Total Buick 100.00% 0.00% 0.00% 0.00% 0.00% 100.00% Cheverolet 18.75% 31.25% 25.00% 18.75% 6.25% 100.00% Dodge 0.00% 100.00% 0.00% 0.00% 0.00% 100.00% Ford 33.33% 16.67% 33.33% 16.67% 0.00% 100.00%

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