Question 908315
TI syntax is normalcdf(smaller, larger, µ, σ).
P(X>185.5) = 1 - normalcdf(-9999, 185.5, 154, 31.5).
Note: The -9999 is used as the smaller value to be at least 5 standard deviations from the mean.
.....
P(X<91) = normalcdf(-9999, 91.00, 154, 31.5).
Since this is a continuous function, we have P(x < 91) = P(x &#8804; 91)