12. Also of interest is whether there are any differences in the waiting time distributions by self reported race of the survey participants. Participants classified themselves into 1 of 3 racial categories: while, black, other (did not identify as either black or white). Following are the results from a simple regression performed to relate waiting time to race: 37 =51.5 +19.3X1+ 2.6X2 where X1=1 if the respondent identifies as black (and 0 if not), and x2=1 if the participant identifies as other (0 if not). The standard error of the slope for X1 is 1.2, and for x2 is 2.5. The R2 is 0.01. -Based on this regression model, what is the estimated mean waiting time for participants who identify racially as Other (not White or Black): I: a. 51.5 minutes I: b. 70.8 minutes I: c. 54.1 minutes 1 point