Lucy and Helena go to the same gym. The means and standard deviations of the number of times they work out per week for a sample of 10 weeks are reported below: Lucy 5.32 0.67 Helena 4.19 2.83 Based on this information: (i) Who is working out more? Write Lucy or Helena. (ii) How do you know? Write the letter of the rationale that justifies your answer here: a. Lucy's standard deviation is less than Helena's. b. Helena is less consistent in her working out than Lucy. c. A greater standard deviation means more working out. d. Lucy's mean is greater than Helena's