In a cross-country bicycle race, the amount of time that elapsed before a
rider had to stop to make a bicycle repair on the first day of the race had a
mean of 4.25 hours after the race start and a mean absolute deviation of
0.5 hour. on the second day of the race, the mean had shifted to 3.5 hours
after starting the race, with a mean absolute deviation of 0.75 hour.

the question- interpret the change in the mean and the mean absolute deviation from the first to the second day of the race