a. If the random variable X has a normal distribution with mean 40 and std. dev. 5, calculate the following probabilities. i. P(X > 43) = ii. P(X < 38) = iii. P(X = 40) = iv. P(X > 23) =

b. If the random variable X has a normal distribution with mean 40 and std. dev. 5, calculate the following probabilities. i. P(X > 43) = ii. P(X < 38) = iii. P(X = 40) = iv. P(X > 23) =