Probability values for specified events.
A normal population has a mean of 80.0 and a standard deviation of 14.0
[a] Calculate the probability of a value between 75.0 and 90.0
[b] Calculate the probability of a value of 75.0 and less.
[c] Calculate the probability of a value between 55.0 and 70.0
[d] Calculate the probability of a value of 85.0 and more.