Normal probability can be calculated using matlab. Let X have a normal distribution with mean 11.3 and standard deviation 5.7.

(a) find the cumulative probability of 9.31 or smaller or P(X ≤ 9.31)

(b) create the standard normal distribution function,F(z)

F(Z)= 1/√2∏ ∫-∞ to 2 ℮^-t^2/2 dt

from F(0) to F(2.9) at increment ∆z=0.1