A population of values has a normal distribution with $\displaystyle \mu={197.8}$ and $\displaystyle \sigma={18.6}$. You intend to draw a random sample of size $\displaystyle {n}={191}$.

Find the probability that a sample of size $\displaystyle {n}={191}$ is randomly selected with a mean between 193.9 and 198.1.
P(193.9 < M < 198.1) =

Enter your answers as numbers accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.