When Adam runs the 400 meter dash, his finishing times are normally distributed

with a mean of 77 seconds and a standard deviation of 3 seconds. If Adam were to run

49 practice trials of the 400 meter dash, how many of those trials would be between

81 and 83 seconds, to the nearest whole number?

400 meter dashes run in 77-3 seconds were accomplished by running the first and second 400 meters in a mean time of (81.83) seconds, respectively. 400-meters run in 83 seconds were run with the first and second 81 covered in mean times of 21.7 (20.8-22.7) and 23.8 (22.5-25.0). is what i think but im not sure