The data given in Table 3.16 are the speeds (in miles per hour) for a random sample of 12 cars driving down a given section of a highway that has a posted speed limit of 65 miles per hour.

a. Calculate Q₁, Q₂ and Q₃ for these highway speeds.

b. Find the range and the IQR.

c. Draw and clearly label a boxplot of these highway speeds.

Table 3.16

Transcribed Image Text:

Speeds (in miles/hour) for a Random Sample of 12 Cars 72 70 63 68 75 80 65 67 68 70 68 65