Many people like to ride roller coasters. Amusement parks try to increase attendance by building exciting new coasters. The following table displays data on several roller coasters that were opened in a recent year.

a. Identify the individuals in this data set.

b. What are the variables? Classify each as categorical or quantitative.

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Roller coaster Туре Нeight (ft) Design Speed (mph) Duration (sec) Wildfire Wood 187.0 Sit down 70.2 120 Skyline Steel 131.3 Inverted 50.0 90 Goliath Wood 165.0 Sit down 72.0 105 Helix Steel 134.5 Sit down 62.1 130 Banshee Steel 167.0 Inverted 68.0 160 Black Hole Steel 22.7 Sit down 25.5 75