a. Did Jeff or Mia rank better in their respective groups? Use Z-scores to explain your reasoning. [6] b. What percent of triathletes did Jeff finish faster than in his group? [Remember that being faster than someone means that your time is iess than theirs. ] [4] c. What is the R code that would calculate the answer in part (b)? [2] d. Find the cut-off time (in seconds) for the fastest 5% of athletes in the women's 25-29 age group. Remember that this would be the athletes with the shortest 5% of time to finish. [5] e. What time (in seconds) in Jeff's age group would be an equivalent performance to Mia's time in her age group? [5]