Consider a random variable, X, with a normal distribution having mean 25 and standard deviation 79. What is P(-189.09 < X < 230.4)?
z-score (lower) = (-189.09 - 25) / 79 = -2.71
z-score (upper) = (230.4 - 25) / 79 = 2.6
normalcdf(-2.71, 2.6) = 0.9919
