Question

For women at hartford college, times to run 400 meters are normally distributed with a mean of 84 seconds and a standard deviation of 7 seconds. what percentage of the times are more than 91 seconds? more than 63 seconds?

Answer 1

z=(63-84)/3= -21/7= -3
P(x>63)=p(z > -3) = .9987 or 99.87%