help with this code please not exacly sure how to get the number with negative splits. Thank you

\#In competitive marathon, it's generally better to have a negative split \# (although very hard to do), which is to run the second half of the race \# faster than the first half. What percent of the runners in our data had * a negative split? Round your answers to 3 decimal places. \#In competitive marathon, it's generally better to have a negative split \# (although very hard to do), which is to run the second half of the race \# faster than the first half. What percent of the runners in our data had * a negative split? Round your answers to 3 decimal places