Aclass measured the radius and circumference of various circular objects. the results are plotted on the graph. 7,44 6,38 4,25 3,18. a. does there appear to be a proportional relationship between the radius and circumference of a circle? explain or show your reasoning. b. why might the measured radii and circumferences not be exactly proportional?

The probability that a u.s. resident has traveled to canada is 0.18 and to mexico is 0.09. a. if traveling to canada and traveling to mexico are independent events, what is the probability that a randomly-selected person has traveled to both? (page 109 in the book may ) b. it turns out that only 4% of u.s. residents have traveled to both countries. comparing this with your answer to part a, are the events independent? explain why or why not. (page 119 may ) c. using the %’s given, make a venn diagram to display this information. (don’t use your answer to part a.) d. using the conditional probability formula (page 114 in the book) and the %’s given, find the probability that a randomly-selected person has traveled to canada, if we know they have traveled to mexico.